So glad I found this site because I have an interesting observation/question. Does anyone else out there have goldfish that get sick/stressed when the weather changes? Mine do very well until we have a cold front or nasty weather come in. Then they all go to the bottom and start iching up. A 50% water change and tablespoon salt:5 gallons water brings them out of it. 55 gallon tank, 2 OTB bio filters, vaccum monthly anyway and change the filter carts, house stays a constant temp (67). Biggest fish in the tank is about 1" long, the rest are smaller, have 20 all together. These are your run of the mill feeders that I used to set the tank up, however their personalities are like a little community of people. Anyone have any pointers on this or if anyone else has observed this please let me know. LOL! Might be good research!