Originally Posted by ilikefish_
Just a thought...when they say in pet stores minimum of 25 35 ect. gallons for fish and they keep them in a little small tank with like 3-4 other fish...do they live in there or what?
I can best explain it this way as I am a former pet store manager:
Assuming you are talking about individual tanks and not systemized sections, the fish are put in tanks for a short amount of time. Most often, the fish are sold and replaced weekly which looks like the same fish are there for a long time. HOWEVER, Can these fish survive when overcrowded for short periods of time? Yes. Will they grow to be large versions of themselves in these conditions? NO. This is why you don't do at home what you see in a pet shop. ( The old "Do as I say, not as I do" thing.
) Here's the bottom line tho, the amount of oxygen in the water determines how many fish can be put in the tank. In pet stores, usually a larger than average blower is used to supply air to the tanks to help keep the water well oxygenated. Truth is, even under these conditions, if there are too many fish in the tank, they all die. PERIOD. All because they used more oxygen from the water than there was available. So when you look at the fish in a pet store, trying to decide whether to buy them, look at their respiration rates. If they are breathing slowly or normally and swimming normally, they are fine. Don't concern yourself with the over amount of fish in the tank.
Hope this helps