dan0 Posted March 2, 2010 Report Share Posted March 2, 2010 Friend has a freshwater community tank but is having death after death recently. Fish look pale and have no eyes when dead. Ammonia, phosphate, nitrite and nitrate are all good, tested with new test kits. Water is from 5 stage RO with recent membrane. Have used furan 2, now running formalin, always runs U.V. Of the fish I can remember are; large ghost knife, bosemanies (?) and sharks. Last fish added was a ~12cm polo shark. Any ideas?? Quote Link to comment Share on other sites More sharing options...
phoenix44 Posted March 2, 2010 Report Share Posted March 2, 2010 how big is the tank, and if he is using RO water, what is the TDS? Quote Link to comment Share on other sites More sharing options...
jim r Posted March 2, 2010 Report Share Posted March 2, 2010 I have no idea what is killing the fish but would suggest forget r/o and do regular water changes (daily) and add absolutely nothing for at least a week and hopefully this will slow down any fatalities. Quote Link to comment Share on other sites More sharing options...
dan0 Posted March 2, 2010 Author Report Share Posted March 2, 2010 Tank is about 600L, will get a TDS tomorrow. Quote Link to comment Share on other sites More sharing options...
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