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Related Articles & Questions
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Freshwater Semi-Aggressive Fish: Top Secrets for a Thriving Tank
Learn how to care for semi-aggressive fish, recommended diet & aquarium setup. Find the right food, supplies & equipment at your neighborhood Petco.
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GloFish Care Guide: Tank, Food, & Compatibility for Thriving Fish
GloFish are brilliantly colored and beautiful fish. Learn how to care for GloFish, what to feed them, how long they live, their ideal tank size and more.
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Aquarium Hardscape: The Complete Setup Guide
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Learn more about Killifish and their care to see if they are the right aquatic life to begin or add to your aquarium.
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- Health & Wellness
What's the white cotton stuff in my fish tank and how do I remove it?
Thanks for reaching out. This problem is perplexing, but possibilities include fungal or bacterial overgrowths. A good cleaning might help to alleviate your problems. Continue to test water quality and correct problems. Sometimes the over-growth of anaerobic bacteria (those which grow in low or no oxygen conditions, at the bottom of the tank), can form strange formations of detritus. Submitting a sample to a lab might help determine an answer. Good luck.
Updated on September 24th, 2025
- Vet Q & A
My fish filter has white specs. Is it mold or mineral deposits?
Thanks for reaching out about Corn and including photos. This could be mineral deposits but is difficult to tell in the photos. Mold usually does not grow below the water level as needs oxygen. Clean the filter well. A sample of the material can be acquired and a veterinarian might be able to help by examining under the microscope. Good luck.
Updated on September 24th, 2025
- Food & Nutrition
Can my goldfish live long in a bowl with no filter and daily cleaning?
A fish bowl is acceptable but not recommended. Goldfish produce much more waste than other fish. This requires powerful constant filtration and water circulation/oxygenation to maintain adequate water quality. Furthermore, a bowl will quickly become too small for a healthy goldfish. Ideally, one goldfish requires a tank of at least 20 gallons. If you decide on a bowl, you will need to perform partial or complete water changes daily or at least every 2 days. Use aged/conditioned water that is temperature matched to tank water. There are small filters and air pumps that may fit in a good sized bowl to extend the time between water changes. Feed once a day and use a pelleted diet that sinks. Lifespan will depend on tank size, water quality and diet.
Updated on September 24th, 2025
- Vet Q & A
Why is my fish resting at the bottom and can't open its mouth?
Check the water chemistry and quality first. Elevated ammonia or nitrite levels can be toxic. Partial water changes can be done to stabilize and improve water chemistry. Use only aged or conditioned water that is temperature matched to prevent further stress or shock. For goldfish, a range of 65F to 72F is recommended. Check the filter and rinse the sponge with tank water, not tap water, to spare beneficial bacterial populations and to maintain water quality. The tank may not be large enough to support 5 goldfish. Generally, 20 gallons should be allowed for the first goldfish then a 10 additional gallons should be provided for each additional goldfish. This is due to the larger than average bio load (wastes) they produce. Consider a larger tank or decrease the number of fish in one tank. Use a filter that is rated for at least twice the volume of the tank and add an airstone and pump for increased oxygenation. Plain aquarium salt (NOT table salt). Can be used as a general tonic. It will reduce stress, improve gill function, aid in any recovery and may treat or prevent minor infection. Dissolve 1 teaspoon of salt per gallon of water in a cup of tank water and gently pour it into the tank. Treat for 10-14 days. When performing water changes, add salt only to the amount of water being replaced, not the entire tank volume.
Updated on September 24th, 2025
- Vet Q & A
20-gallon tank setup: What fish and supplies do I need to get started?
A fish tank will need a filter, a light/hood and a heater. Make sure the filter is rated for at least twice the tank volume. The heater should be adjustable since water temperature will depend on the species of fish. Good "starter" fish include Tetras, Mollies, Danios or Tetras. A new tank should be set up and left running empty for several weeks before adding fish. A pinch of flake food can be sprinkled in daily. This "cycling" will allow a population of beneficial bacteria to colonize the tank and filter. These bacteria will break down wastes (ammonia, nitrites and nitrates) which are toxic to fish.
Updated on September 24th, 2025
