Here are his tips for first-time fish owners. It's not a good idea to buy a fish on impulse at the pet store and then try to figure out how to keep it alive. This allows plenty of time for the biological filtration system to establish itself. If you don't wait, ammonia will accumulate and rise to toxic levels, devastating all fish in the tank. This combination is reliable for maintaining a clean and healthy tank for the beginner aquarist.
Faith says that a good rule of thumb is one inch of fish per gallon of water.
Overstocking may lead to toxic death or territorial fighting. Though it may be fun to feed that new fish, it's a good idea to regulate the amount of food being consumed. Only feed as much food as the fish will eat in 15 minutes. Healthy fish have a clean and smooth appearance to their bodies and can maintain a level position in the water. They eat readily and have a consistent activity level.