Since I've upgraded from a 29g to a 90g I can't keep dwarf gouramis alive. The one that was in my 29 died before I was able to move all my fish over to the bigger tank. So I got another one and he died the next day. So I got another one and he looks like he's about to die as well.
What could be the problem, the other fish are doing fine, even my german blue rams (well most of them anyway). I had one out of four
GBR die but everyone else is fine. Last time I tested my water it was good. I'll test it again if I need to. All this
DG does is sit on the bottom of the tank hiding in the plants. I'm stumped as to what to do. Any suggestions??