I have a goldfish in a 29g-nitrates were 0, ph was about 6.4, but my goldfish is showing some signs of what I think is swimbladder disease. Sometime she has trouble balancing herself and starts to flip over, but for the most part she is doing well, can swim and is eating. I have fed green beans and corn-should I give it a epsom salt bath in a separate tank? Should I try wide spectrum antibacterial medicine? Thanks, I want to treat this before it gets worse.