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Related Articles & Questions
- Care Sheets
Complete Tetra Care: Tank Setup, Food, & Compatibility Tips
Learn how to care for a Tetra, recommended diet & habitat setup. Find the right food, supplies & equipment at your neighborhood Petco.
Updated on April 9th, 2026
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What Do Small Fish Eat? Freshwater Feeding Guide
Feeding your freshwater fish isn't as simple as adding a pinch of flakes! Read these three tips to learn more about how to provide your pets the nutrition and environment they need.
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Freshwater Community Fish: Care, Setup & Compatibility Guide
Learn how to care for freshwater community fish, recommended diet & aquarium setup. Find the right food, supplies & equipment at your neighborhood Petco.
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Best Fish for Beginners: Top Freshwater Picks
Some fish species generally do well in smaller aquariums, are more adapted to aquarium life, & can be slightly more forgiving with water quality fluctuations.
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Vet Q & AFirst fish tank: What Tetras and supplies for my 12-inch tank?
Before you buy any fish, you will need to set up the tank. A basic set up includes: a tank, filter, hood/light, heater, gravel and some decor. The tank should run without fish for at least 4 to 6 weeks. This gives it time to cycle. The Nitrogen Cycle is critical to the health of the tank and any fish you will be keeping. During this time, beneficial bacterial will populate the filter and substrate (gravel). These bacteria will be responsible for breaking down fish wastes and other wastes (uneaten food, dead plants, etc.). You will need a home test kit to monitor water chemistry (ammonia, nitrites, nitrates, pH) or you will have to submit water samples for testing. Most pet stores will do this for free or for a small fee. At first, you will see high levels of ammonia and nitrites. Over time, as bacteria grow, these levels will drop. When ammonia and nitrites are at 0 ppm and nitrates are below 20 ppm, you can consider adding fish. Regular (every 1 or 2 weeks) partial water changes as well as filter changes will be needed to maintain stable water chemistry and adequate water quality. The size of your tank will determine what fish and how many you will be able to keep. Most Tetras do best in groups, so a 12 inch tank may not be large enough. There are several article in the Petco Pet Education Center, formerly Petcoach Library that will provide more detailed information. Click on "Educational Center" at the top of the page, then scroll down to "Articles" and click. Use the Search Bar to find articles regarding aquarium set up and fish keeping.
Updated on September 24th, 2025
- Training & Behavior
Moving fish long distance: How to transport and feed them safely?
Thanks for reaching out. If is a good idea to fast for 1-2 days prior to shipment, this decreased feces and will help to keep the ammonia down. Typically clear bags are utilized with about 50% water, and 50% air/oxygen used. A local pet store might be able to assist, as they get shipment in (so have older bags and boxes, which need to be disinfected) and hopefully the skills to ship. Check with the airline also, box needs to be well labelled "LIE ANIMALS" and "THIS END UP". Sometimes a health certificate for interstate travel is needed, so contact airline and State of Utah, veterinarian. Good luck.
Updated on September 24th, 2025
- Food & Nutrition
What's the best food for small fish I found in a freshwater pond?
You can try feeding them commercial fish food or meal works from your local pet store. If you would like a consult, you can provide pictures and we can give you a better idea of what kinds of fish they are and if they have special requirements for their diet. Hope this helps!
Updated on September 24th, 2025
- Food & Nutrition
What's the best food for my Rosaline Sharks, Congo Tetras, and Pleco?
The Sharks and Tetras can eat a high quality flake food every day. Brine shrimp (either live or frozen) and blood worms can also be offered. Tetra and Hikari are my own recommendations. The Pleco can eat fresh greens or vegetables. Remove any uneaten food after 24 hours to prevent fouling the water. Sinking wafers or pellets can also be offered.
Updated on September 24th, 2025
- Health & Wellness
Just got a small fish. What breed is it and how do I care for it?
Thanks for reaching out about you fish. It is believed to be a Comet goldfish. Water quality and nutrition is the key to success. Testing water parameter for pH, ammonia, nitrite and nitrate will give you guidance for a healthy environment. Purchased food should be rotated out every 3 months as vitamin C and other nutrients degrade over time. Trying to maintain water temperature can be challenging with out a heater, but most fresh water fish tolerate some changes. Good luck.
Updated on September 24th, 2025
