about best health o fish in a tank

Today one of my fish died. I don't know if it's because of the PH or the temperature. Help!

What fish can live to be over 100?

I have 2 fish in my fish tank, (not salt water) my filter stopped working, what can I do? Do I move them from that tank and p...

Like how do I clean out all the fish poop out of gravel on the bottom of a fish tank?

i plan on getting a turtle and just wanted to know if i could add any other pets into the tank

well me and my friend randomly decided to get some fish, but we dont know how many fish are allowed in the tank we've got. it...

please I need one I have two sharks that get up to 18 inches long and all I have is a 10 gallon

What kind of fish can go in the same tank as a betta fish???

I have a 55 gallon tank with an oscar. what other fish could I put in the tank? I had a jack dempsey in their, but the osca...

I just bought a fish tank not even a few months ago and I cleaned it all out when my fish batch of fish died and then I put m...