5g tank, was two gouramis till one up and died for no apparent reason the other day, and two plecos, now there are only the two plecos and one gourami. I'm using the filter that came with the tank, a Hagen AquaClear.
I have added aquarium salt already. I also bought melafix and added the first dose this afternoon.
I suspect the point about water quality is probably very close. This morning while I was in the shower I accidentally got some water in my mouth - and it tasted like soap. Living on a farm and using pond water, god only knows what goes on and how it's filtered before hand. I think there has been a sudden decline in water quality this week - it has always tasted kind of funny, not to mention that it often smells. All my readings (ammonia nitrite nitrate hardness pH) are within perfect parameters.
I think I will have to start using my parent's city water if this is to continue - the fish seem to go for a certain period of time with no problems, then all of a sudden one will die without any previous signs of illness, or a fungal infection will crop up. I guess it might have more to do with the cycles the pond water we are on goes through than how my fish are more susceptible to disease than other fish.
Thanks for your help though - it seems that if I had normal water and was going through this, what I am doing would actually work. Good to know for when I move into a house in a *town* somewhere that has GOOD water.
