Ok. I'm tank sitting adn I cleaned out the tank last night and this morning one of the fish was upside down. Here's a picture of the fish. I cleaned out the tank and put the fish in a small container for about 45 minutes while I cleaned the tank. Then filled the tank with water and put the algae remover in and food. The algae romover is a form of conditioner for the tank and I added a water conditioner too to make sure it was ok. Waited about 30 minutes before putting the fish in. When they went in they looked ok. I watched them for another 30 minutes to make sure they were ok, and then this morning like I said, this on is like this. Later on I went in, after I left freaking out, and then two tetra died and a silvery black one. they have three of those silvery black ones, two of the big silver orange black spottd ones, and three tetras. But now they will have two silvery black ones, one big one, and one tetra. Help me! Should I take the fish out? keep them in? Buy new fish? I don't even know the names of the fish!! PLEASE HELP!