I have 6 guppies and 10 tetras in a 30 cm wide, 30 cm long and 40 cm deep tank. Four of my fish have died from what looks like starvation, and another one is going downhill---his bones are really prominent and he is lying on the bottom of the tank. I went down to check them just now, and three of the other guppies have long, translucent strings of something coming out, and I know its not poo. I think I'm going to take out the pebbles on the bottom of the tank, and thoughroughly wash the ornaments and filter. I will look for a dewormer, or similar at a pet store, but cant do this for at least a few days. The first fish died 8 months ago, the secound 6 months ago, the third 3 months ago and the forth about a month ago. I have had them since May 2008. I will try to get photos posted. Please tell me what else I can do, I dont want to loose any other fish. Help!!!!!