We have been having a few problems with our tank, we bought it before Christmas and took our time setting it up and stocking it (although after reading stuff since I acknowledge that we probably still did it too quickly). everything was going well but lately our fish seem to be falling ill and dying.
First we lost a zebra danio, then one of our gourami fell ill (he is now looking a lot better in the hospital tank), this weekend we have lost two of our panda cory. We lost a couple of other fish to nipping (we think by the other gourami) but these four illnesses and deaths are unexplained.
I think the gourami illnss is unrelated as I think he might have had a swimbladder infection (lost bouyancy control) but I am getting concerned about the other fish dying and was wondering if you guys might be able to offer any suggestions. We noticed the two panda's kind of flicking about as they swam round the tank, I suppose a little like they were having a fit. The one we have just taken out also looked kind of yellow inside but I don't know if that's just decomposition setting in or whether it means anything.
Our Nitrates have been at 0 for the last month, our pH has been steady at 7. We don't have an amonia test as the aquarium shop said that if we have nitrites we would also have amonia so we wouldn't need it. We are now wondering whether we should invest. We have been religously changing 25% of our water weekly, two weeks ago we "washed" one of our filter sponges (in aquarium water we had just taken from the tank during a change) and on Saturday we changed the carbon pad in the filter.
Sorry I have waffled on a bit but any help/suggestions would be great