I have a 30 gallon tank that has been setup for about 3 months, which has zebra obliquens, and an emerald catfish. the zebras have been in their and bred quite a few times, but lately, they started to die off. I had 2 females, with no signs of issues, die off within a week of one another. one day they were lethargic, then the next dead. then it happened to my male not very long after. I replaced the male, and hes been in there about 2-3 weeks, and hes showing signs of being lethargic as well. also, I have 2 females that had gotten cloudy growths over the eyes. one has it on both sides, while the other on only one. the fish that have the cloudy eyes are swimming fine, but im not sure whats going on in this tank. I have no ammonia for sure, it was tested with an api test. the other parameters im unsure of. I have done 50 percent water changes 3 out of the last 4 days, with no seeming improvementto any of them... i can add pics if need be. please help here, i dont want to lose any more fish in this tank


