lights and diatom

[Amphiprion]

The Bio-Wheel very well could be a contributor to nitrate levels, as would a skimmer with sub-par performance. As to exactly that causing your diatom problem, again, there are too many variables involved. I would think, though, that getting the nitrate down a bit won't hurt the situation.

 

[Almondsaz]

Thank you Amphiprion...I have removed the Marineland/dual biowheel filter. I will let the sump/fuge hopefully do their magic and test tomorrow for the nitrates. Appreciative of the advice.

 

[Amphiprion]

No problem. Hope that is the root cause for you. Try doing a water change, then test. Give it a week or so and test again to see if it has risen to its former level.