So, I figured I would give cold water fish a try. I emptied my 20 gallon tank, which most of the fish in died from a disease that spread though all them of them despite my attempts at medication, filled it up with all new fresh water, added a very fine silica sand, and an extra filter. Then I added two small goldfish-1 comet and 1 fantail. Then after a bit I added 2 weather loaches, and eventually a very small pleco for the algae that has been building up due to the sun shining in more in the mornings. They were doing great for a while then the comet started to go downhill. The commet, before it was bought was treated with several other goldfish at the store before I bought him because ich and some other disease spread throughout the crop, I later found out. While the commet didn't make it, the fantail, who was a little bigger, did. So I went to a different store, and got two more-a very tiny 1 inch fantail I couldn't resist and a larger comet. Everyone was doing okay for the first few days. Then a few mornings ago, I fed everyone as usual, went to school, came back around 2pm and my first larger fantail had pineconed and had puffy eyes. (he had come from a different tank than the treated sick ones) I had recently noticed he was hiding a lot and lying on the sand. I took him out and put him in my large bucket I use for putting fresh water in for cleaning tanks-holds approx 20g of water, maybe a bit more. I through in a little epsom salt and waited for morning, when I expected to find him dead. A day later he was still alive, so I tried some bloodworms. He ate them! (he had never stopped eating) So spirits were starting to come up a little. I noticed maybe a day after that his scales were less stuck off and his eyes less puffy. Gave him bloodworms the next day and he ate those as well. Maybe 3 or so days since I put him in the bucket, he became more and more normal. More mobile, eating worms, pooping, and his body had basically gone back to normal. No one else in the tank is exhibiting any of this behaviour except the new goldfishes who Ive probably had a week now, seem to lie on the sand a lot. I was thinking I would move the goldfish in the bucket back into the tank on Monday or Tuesday. Today he is looking perfect, ate a shrimp pellet and is moving around a bit. I am going to change some of his water. I did, however, do a little water change yesterday and added a bit more epsom salt. Any thoughts? Also, please keep comments on overstocking to yourself. They will all be moved to the 30 gallon the fall and probably eventually the 55g when I get a 125 for the sharks. Water prams are 7.2 ph 0 ammonia 0 rites 5 rates take out about 4ish gallons every Friday & feed flakes, bloodworms, veggie rounds, and shrimp pellets.