Hello tufa44 ...my guess would be the canister filter ...I had the same prob when i set my tank up. i was running a fluval 404 and had no idea why i could not get my nitrates down .....did a pile of reading and found that a canister filter is most likely cause more bad then good ...unless you run it empty and pretty much use it as a power head .. but have the option to run carbon or whatever and have more water in the system ......also a few more pounds of liverock wouldnt hurt .....just my 2 cents .... good luck
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