I have had a rope fish for 5 years now, and it has done fine..Never escaped, active at night..the usual. I have it in a 15 gallon tank (I know, small) with two gold fish and a star fish. I had 2 other gold fish in another tank, and one of them contracted dropsy. The other started behaving erratically. I took the erratic fish out of the other tank thinking the fish with dropsy may have somehow been affecting it, and put in in with my rope fish, gold, and angel fish. The gold acted dead after the transition and died the next day. When it did so, it swam into the cave my rope fish usually hangs out in. Now today my rope fish seems to be dying. There are absolutely no discolorations or external abnormalities that I can see. The rope fish floats on the top of the water mostly upside down (which it almost never does) and lies still like it's dead for long periods of time (2-3 minutes) then it might shudder, but still doesn't swim like it usually does. The levels in the water are superb, and this has left me scratching my head and concerned my rope fish will die. Any ideas?