I have a 29 gallon tank have had it for a little while, but I can't seem to keep any kind of fish alive...I had a dojo (weather) loach and he had survived for months even when the other fish died, but a couple weeks ago I noticed the water was pretty cloudy, and I did approximately 80% water change. It was very clear for the first few days (The loach is the only fish I had in the tank) but then became cloudy again. I picked up some stuff called Crystal clear and it cleared the tank up in just a few hours...It says on the bottle to repeat in 24 hours if necessary and it did get cloudy again, so I put some more drops in. (I did follow the directions on the bottle) Then when I got home one evening the loach was laying on its side. I got him to move and he seemed fine for the rest of that day and most of the next...Today, he was upside down when I got in from work. I didn't see anything on the crystal clear stuff that said it would harm any kind of fish, but now I'm wondering if that's not what killed him. Any ideas???? I haven't bought any more fish because I want to figure out what my tank problem is before I do. I don't like my fish to die...It's really depressing. Also, what would be some good beginner fish for the 29 gallon tank if I ever figure out what the problem is? Thanks for your help.