Thanks for your replies.
As for nitrates, my tank registers at zero.
I have cleaned the Eheim cannister filter once ever three months. The first time I cleaned it I was quite surprised at the lack of debris. Usually it was full of stuff when I had a freshwater tank. I assumed the
protein skimmer cleaned most of the gunk, and the live rock lessened the load on the cannister.
The last time I cleaned the cannister, it was acting as a refugium of sorts. I found a lot of
baby shrimp (either that or copepods). Kind of cool.
Cheers,
J