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  1. G

    nitrite please advise

    Hello everyone i am new to this site. I have a 90ltr tank which has been running for 3 weeks, i have guppys,mollys ect all my water readings where fine until i introduced a under gravel filter (i have 2 pump filters also) my nitrite level has gone from 0.3mg/l to 3.3mg/l, i have done a 30% water...
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