05-20-2011, 08:40 PM
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Responding to an old post as I am looking for answers. I am having the same problem with my 60 gal tank. It is 6 mo old and I had three otos, three SAEs, 4 platys, 2 swords, 5 glo-light tetras and 5 neons. One by one my fish started dying and now I've lost one otto, one SAE, one glow-light, three platys and both swords. No symptoms...they just hide (sometimes) and die or just die. I wasn't sure the otto was dead because it was laying upright on the bottom of the tank and I had to touch it with the net to be sure. My levels are great (0 Ammonia, 0 Nitrate, 5 nitrate, 7.5 pH (which is normal for my tank), Temp 78. I suspect low O2 but they were/are not gasping for air, just fine one moment and dead the next. I lost the fiirst few a few days apart and then had a massive die-off the last couple of days. I lowered the level of the tank to increase surface agitation and added an airstone. Fingers crossed... If anyone has been successful combatting this problem please help.