03-05-2012, 12:21 AM
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Attempted to help OP with this tank on 2/28, with regards to cloudy water.
At that time, tank held two Oscars,Jack dempsey,and common pleco(according to OP's response).
Tank was over stocked,underfiltered in my view, and plan of action was suggested to help with both cloudy water,and probable water quality issues with resident's posted which OP as is their right,,chose to disregard.
Now,convicts have been added that may have introduced pathogens and are quite capable of inflicting damage to Oscar's .
Stress, whether it be from crowded condition's,water quality or lack thereof,or from aggressive behaivor of other tankmates, weakens fishes and they then become more prone to bacterial pathogen's,fungus,finrot,parasites,etc.
New fish added could have brought more stress,and or introduced pathogens to the tank that otherwise weren't there.
Medicating fishes under any of the afore mentioned condition's will be effort in futility until condition's are corrected for the symptoms will continue to re-appear.