Ask a question about my fish?

I got a fish tank and evrything was good and my fish were having fish, and I just added water to the fish tank and just 2 days ago I notes that every time that I check my fish tank there are a lot of fish dead I want to know why?

Okay, this is a bit embarrassing, the pets expert posting in the pets forum. Darn lack of fish knowledge, I should stick to bunnies, dogs and birds. ;) Anyway, I have a 20 gallon tank, given to me by a friend. When I first got it I washed everything in it because all her fish had died of some...

Ph is high in this, the second try. All my fish died a few weeks ago, over night. Cleaned out tank and have introduced a few new fish. Now they have began to die. The ph is high, and I am trying to bring it down using peat moss this time. I have a coral rock in the tank. Could this be a problem...

The number of tropical fish that an aquarium can hold depends on the volume of the fish tank. The interior dimensions of the fish tank below are 28 cm, 49 cm, and 52 cm. Each fish requires 10,000 cubic centimeters of water. How many tropical fish will this fish tank hold?