How to Take Care of Your Fish (Tanks)

All different shapes, sizes, and colors. Spikes, tails, pop eyes, you name it, fish have it. Fish are cool. But how do you look after them? All those water chemicals, live food, and business about putting two fish in the same tank sounds scary. However, don't sweat it... just read this guide! It contains all the information you need on taking care of those first fins. This guide takes you through buying fish, putting them in your tank, and looking after them.

Steps

1. 
   1
   Decide whether you want Tropical or Cold water fish. Cold water fish include goldfish and minnows. There are many types of tropical fish, from angelfish to corydoras catfish. Cold water fish are usually a little more hardy, and will survive those first few mistakes.
   • Start off with inexpensive fish, even if you can afford expensive ones. Inexpensive ones are inexpensive because they are very successful in their natural environments or so comfortable in captivity that they even breed regularly and, in either case, do not die easily on their way to and in pet stores.
   • Do not start out with saltwater fish. They require techniques and understanding that are much more complex. Plus, the water you'll have to work with and that may leak is messy, slowly corrosive to metal, and conductive. If you believe you want a saltwater tank, get a medium sized tropical fish tank with some plants and see if you can keep that in perfect order first for a year or so.
2. 
   2
   Decide what kind and how many fish you want.
   • Research before putting species together. Some fish are compatible, others aren't. One might speculate that fish would enjoy some activity in their lives, so don't get just one. (The fish need not be the same species; for some territorial fish, it is best that it isn't. An armored catfish can be a good "companion" for such a beast.)
   • Make sure you can provide any specialized care the fish need. For example, different fish need different foods, and some fish require more frequent maintenance than others. Owning fish is a big responsibility.
   • Some fish are perfectly happy with flakes and can be fed with an automatic feeder, which makes it possible to leave the tank unattended for a week or two (assuming the fish are small so the water doesn't need very frequent changing).
3. 
   3
   Get an appropriately sized tank. Look up the minimum tank size for each fish.
   • For goldfish, buy a tank with 20 gallons for the first goldfish, and 10 gallons for each additional goldfish.
   • For smaller freshwater fish, get one gallon per inch of adult fish.
   • The larger freshwater fish require more room. The volume of a fish, and thus, roughly, the amount of food it turns into waste, increases not with its length but with the cube of its length. Therefore, you could keep two or three Neon Tetras, which grow to only an inch or so, per gallon of water, but three or four big six-inch cichlids would be more than enough for a fifty-gallon tank (assuming they aren't very territorial, in which case they might think only one or two is enough!)
   • Active swimmers such as wild-type goldfish and tetras should have a tank many times their body length. In a small tank, slow swimmers such as fancy double-tailed goldfish and Siamese fighting fish will still be happy.
4. 
   4
   Make sure you have all the proper equipment- filters, heaters (for tropical fish), water conditioner, test kit, etc.
5. 
   5
   Set up the tank and cycle it.
6. 
   6
   Put your fish in. Only add a few fish to start with, and slowly build up the population. Adding too many fish at once can overload your filtration system.
7. 
   7
   Perform partial water changes weekly. 20-30% is a good amount. To do a water change, get a gravel vacuum and siphon out any waste in the substrate. This will pull out water at the same time. Replace the water with water from your tap, but remember to treat it with a water conditioner.
8. 
   8
   Test the water regularly. Make sure you have 0 ammonia, 0 nitrite, and under 40 nitrate.
9. 
   9
   Feed your fish two or three times a day.
10. 
    10
    Monitor your fish. While they eat, sit and observe them. Check for anything strange: changing color, falling off fins, damaged tails, etc. Also, make sure all your fish are getting along.
11. 
    11
    Try not to stress out your fish. This includes putting your hand in the tank when you don't need to, touching them, or jumping near the tank.

    Tips

    • Buy a liquid test kit, as opposed to the strips. Liquid kits are much more precise and less likely to make error than kits that use strips.
    • Live plants can improve water quality and make your tank look more natural.
    • Try to remember to clean your tank once a week to keep your fish healthy and your tank looking presentable.
    • Never jump near your tank or try to touch your fish as it will stress them and they might not eat for a few days. Fish are cool
    • Always remove stray algae floating around the tank as it may cause the fish tank to be cloudy.
    • Don't change out the filter cartridge. The filter is where most of the beneficial bacteria lives and replacing the cartridge creates a buildup of ammonia that can kill your tank.

      Warnings

      • If your tank holds less than 2.5 gallons, do NOT use a heater. If you do, you'll be slowly boiling your fish. Get a larger tank, so you can have room for all your fish.
      • Don't leave out the changing water bit. If you don't do it, toxins build up, making your tank unhealthy and promoting nuisance algae growth.
      • Never clean anything which will be associated with your tank with soap, detergent, or washing powder. These will immediately kill off fish.
      • Air fresheners can also be highly toxic.
      • Don't mix clown fish or Siamese fighting fish (betta) with other species.