I have a 20G heavily planted tank it is about a year old. I am having trouble keeping ottos in the tank every time I get some they die within a month or so. I try to keep three in the tank but rarely have more that one live one. All levels are fine and all other fish are fine. ph is a bit high 7.6. I occasionally put malifix in the tank could that be it? They don't die right after I put the malifix in so I don't think that is the problem. I feed algae pellets but I've never seen the otto eating them. Anyone have any ideas?
I have 3 ottos in my tank and they do fine. I try feeding them algae tables, but they ignore and let the fish eat them. The pH in my tank is 7.0. Maybe the Malifix is the problem, but I'm not sure! 
