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tank issues

  1. Advanced Freshwater Discussion
    Morning: Newer 75gal tank, fully cycled. (reads 0 ammonia, 0 nitrites, ~10 nitrates) pH stable at 7.4, weekly 30-40% water changes and large pothos plant growing out of tank. Water has been tested on 4 different types of kits. 95% of the fish I have tried in this tank has died. I've tried...