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lr rubble questions?


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i was wondering about putting some lr rubble in my 12g nano cube in the 2nd chamber. So far i have a surface skimmer and have switched out the new pump for a more powerful one. Can i just by lr and smash i up w/ a hammer and put it in the back 2nd chamber? also i cant seem to get my nitrates down to zero they are now at 10. any suggestions as how to get it lower. i have been doing weekly water changes of 10% since i got my cleanup crew in. any suggestions as to how to get it down?

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