help! we have had our fish since it was born (6 months ago) and a few days ago it started getting sick. It slowly lost its appetite and all it did was sit there for a couple of days. Now all of a sudden all it does is circle. We think he is going to die soon but hes done this for about 24 hours now. I would just like to see if anyone knows what this could be from in case it could affect our other fish. He is the only one that is sick and we tested the water and it is fine. We also did a partial water change. thanks in advance for any advice.