Quote:
Originally Posted by sirruckus
actually I haven't cleaned the canister filter - all sponge material etc. has been removed, only the ceramic balls are inside.
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The Ceramic balls might be the cause of your nitrates... If you have room in your sump, you might want to consider sourcing a zeovit reactor, use the zeo media and go on the base system (Start, Bak, Food). It's a fairly proven system and well supported.