FAQ

Direct answer: A 20-gallon aquarium is the best starting point for most beginners because it gives you more water volume, steadier parameters, and more forgiving stocking options than a tiny desktop tank.

Beginner context: Small tanks look easier, but they swing faster when ammonia rises, a heater sticks, food is overfed, or a water change is skipped. A larger beginner tank gives you more time to notice and correct problems.

Common mistake: Do not choose the smallest tank just because it costs less up front. Tiny tanks often demand more testing discipline and narrower fish choices.

Go deeper: Start with the Freshwater Aquarium Setup guide before choosing tank size, filtration, and stocking.

Direct answer: Most freshwater aquariums need a tank, filter, heater when keeping tropical fish, thermometer, substrate, lighting, water conditioner, and a liquid test kit for ammonia, nitrite, nitrate, and pH.

Beginner context: The filter and test kit matter more than decorative upgrades. A filter supports beneficial bacteria and circulation, while testing tells you whether the tank is safe before fish behavior becomes the only warning sign.

Common mistake: Buying more gear before knowing the tank’s goal can lead to mismatched filters, lighting, or heaters. Decide whether the setup is a simple community tank, shrimp tank, planted tank, or quarantine tank first.

Go deeper: Use the Aquarium Equipment Finder if you want the gear list narrowed to your tank size and goal.

Direct answer: Cycling means building the beneficial bacteria that turn toxic ammonia into nitrite and then nitrate. A cycled tank should read 0 ppm ammonia, 0 ppm nitrite, and a manageable nitrate level before normal stocking.

Beginner context: Ammonia comes from fish waste, uneaten food, and decaying material. During cycling, the tank is not just “running” with water in it; it is growing the biology that keeps fish from being exposed to waste spikes.

Common mistake: Do not assume clear water means the tank is cycled. Clear water can still contain ammonia or nitrite.

Go deeper: The Freshwater Aquarium Setup guide explains where cycling fits in the full setup order.

Add an ammonia source, test regularly, and wait for the tank to process ammonia into nitrite and then nitrate. Fish food, pure ammonia, or a bacterial starter can be used, but the proof is the test result, not the calendar.

Expect the process to take several weeks. Only add fish once ammonia and nitrite consistently test at zero and nitrate is controlled with water changes or plants.

Good beginner fish are hardy, peaceful, and suited to your tank size. Guppies, platies, danios, and many small tetras can work, but the right answer depends on adult size, group needs, water temperature, and tank mates.

Research the adult size and social behavior before buying. Schooling fish should be kept in groups, and livebearers can reproduce quickly.

The old “one inch of fish per gallon” rule is only a rough warning, not a stocking plan. Adult size, body shape, activity level, territorial behavior, filtration, feeding, and maintenance all matter.

Start lightly stocked and add fish slowly after the tank proves stable. Overcrowding usually shows up as poor water quality, stress, aggression, or repeated illness.

Most community fish do well with one or two small feedings per day. Feed only what they finish quickly, and remove obvious leftovers when possible.

Overfeeding is one of the easiest ways to create ammonia spikes, cloudy water, algae, and filter sludge. If in doubt, feed less and watch body condition over time.

Direct answer: Test regularly, change 10-25% of the water every 1-2 weeks for most stable community tanks, avoid overfeeding, and keep filter media wet and gently cleaned in old tank water when it needs rinsing.

Beginner context: Water quality is a pattern, not a single reading. Keep a simple log of ammonia, nitrite, nitrate, pH, and temperature so you can spot trends before fish start gasping, hiding, flashing, or clamping fins.

Common mistake: Do not replace all filter media at once unless there is contamination. Throwing away established media can remove the bacteria that make the tank stable.

Go deeper: Browse the water-parameters guides when a reading is changing and you need the next diagnostic step.

Yes. Beginner-friendly plants can absorb nitrate, provide cover, and make the tank more natural. Java fern, Anubias, Java moss, and many floating plants are forgiving choices.

Match plants to the light, substrate, and fish. Some plants should not be buried by the rhizome, and high-light setups may need more algae management.

Watch for cloudy water, algae growth, fish gasping, clamped fins, white spots, bullying, filter flow loss, heater problems, and sudden parameter changes.

Most troubleshooting should start with water tests, temperature, oxygen, recent maintenance, new livestock, and feeding changes before medication or equipment swaps.

Direct answer: Stability matters most. Neocaridina shrimp can tolerate a reasonable range, but they do poorly when ammonia, nitrite, temperature, GH, KH, pH, or TDS swing quickly.

Beginner context: A fully cycled tank, gentle filtration, mature biofilm, safe minerals, and careful water changes are more important than chasing one perfect number.

Common mistake: Do not make repeated large corrections because one test result looks slightly off. Fast parameter changes can be worse than a slightly imperfect but stable tank.

Go deeper: Start with the Shrimp Guides hub before buying shrimp or changing remineralizers.

Direct answer: A common Neocaridina target is pH 6.5-8.0, temperature 68-78°F, GH 4-8 dGH, and enough KH to keep pH stable. Always confirm the breeder’s water when possible.

Beginner context: GH supports molting minerals, KH helps buffer pH, and temperature stability reduces stress. The exact target can vary by source colony, but ammonia and nitrite should always be zero.

Common mistake: Do not use pH adjusters as a routine fix. They can create sharp swings and do not solve the mineral balance underneath the number.

Go deeper: Use the Shrimp Guides hub for parameter stability, molting, and setup decisions.

Start with a fully cycled 5-10 gallon or larger tank, a sponge or intake-protected filter, stable temperature, inert or shrimp-safe substrate, and plenty of moss, biofilm surfaces, and hiding places.

A mature tank is easier than a brand-new one. Give the tank time to grow biofilm before adding a full shrimp colony.

Neocaridina shrimp graze on algae and biofilm, but a balanced shrimp food helps cover minerals and protein. Feed tiny amounts and remove leftovers.

Overfeeding causes more shrimp problems than underfeeding in many established tanks. Uneaten food can foul water quickly.

A planted, stable tank can hold a growing colony, but start modestly. Ten to twenty shrimp in a mature 10-gallon tank is easier to observe and correct than a crowded first colony.

Population growth depends on food, cover, filtration, and maintenance. Let the colony size respond to the tank rather than forcing a target number.

They can be kept with some small peaceful fish, but baby shrimp are often eaten. Species-only shrimp tanks usually breed better and stress less.

If you keep fish with shrimp, use dense plants, moss, and hides, and avoid large, aggressive, or curious predators.

For many stable shrimp tanks, 10-20% weekly or every other week is safer than large sudden changes. Match temperature and minerals as closely as practical.

Slow, consistent water changes protect molting shrimp and reduce parameter shock.

Stable water, mature biofilm, hiding places, and enough food usually lead to breeding. Females carry eggs for a few weeks before releasing miniature shrimp.

Protect shrimplets by keeping intakes safe and avoiding tank mates that hunt small invertebrates.

Watch for failed molts, sudden deaths after water changes, copper exposure, ammonia or nitrite, temperature swings, and a colony that slowly stops breeding.

When problems start, test water first and review recent changes before adding treatments.

They do not need complicated feeding, but they benefit from a varied diet that includes biofilm, algae, quality shrimp food, and occasional vegetable or mineral-based foods.

Feed lightly. A healthy shrimp tank should not depend on heavy daily feeding.

Color comes from genetics first, then stress level, diet, lighting, substrate contrast, and overall health. Buy good stock and keep parameters stable.

A dark substrate and low-stress environment can help shrimp show stronger color, but no food can fully replace genetics.

Direct answer: Test ammonia, nitrite, nitrate, pH, and temperature first. Then check oxygen, filter flow, recent water changes, new fish, aggression, and feeding before choosing a treatment.

Beginner context: Many disease-like symptoms begin with water quality or stress. Gasping, hiding, clamped fins, flashing, and lethargy can all appear when the environment is wrong.

Common mistake: Do not medicate the display tank before checking water unless the situation is urgent and the symptoms clearly match a known disease. Wrong treatments can stress fish and damage beneficial bacteria.

Go deeper: Use the Fish Health hub for symptom-specific troubleshooting and quarantine guidance.

No. Pete’s Aquatics provides freshwater aquarium husbandry guidance, not veterinary diagnosis. For urgent fish illness, mass losses, severe wounds, unusual symptoms, or possible contamination, consider help from a qualified aquatic veterinarian or experienced local aquarium professional.

Use this site to organize the first checks: water parameters, temperature, oxygen, stocking, quarantine, and recent changes.

Direct answer: Use product recommendations as a shortlist, then match the choice to your tank size, livestock, maintenance style, noise tolerance, and budget.

Beginner context: The best filter, heater, light, or test kit depends on the job. A shrimp tank, quarantine tank, planted display, and high-flow community tank can need different tradeoffs.

Common mistake: Do not buy the highest-rated or largest item automatically. Oversized flow, excessive light, or unnecessary add-ons can create new problems.

Go deeper: Compare categories in Aquarium Equipment, browse Product Reviews, or use the Aquarium Equipment Finder.

Some product links may earn a commission, but recommendations should still be based on fit, use case, care needs, and clearly stated tradeoffs. Affiliate links are not a reason to buy gear you do not need.

When a recommendation involves equipment, compare it against your setup goal and look for signs that the guide explains who the product is and is not for.