Its the use of canister only. I used a 180 gallon rated canister in a 29 with my cichlids as a trial for my 125 project. I left the hob filters going and turned them off one day when I went to work 9 hours later my fish were almost toast all near top or sunk to bottom. Only lost one but it was my prized male kribensis and first fish in my cichlid tank. Very sad. I realized it and went and got an air pump and tried to aerate like crazy. Put on three hobs to stir in water and lowered the water level to increase splash and oxygenation. I only lost one but it shouldn't have happened.
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