Marc--I really don't know. I bought these guys off a buddy of mine while we were still in the later stages of the remodel. I don't really see the polka dots day to day. They only seem to come out with the flash.
Jim--Thanks! Well, you guys might berate me, but I feed a _lot_. There's a lot of food that passes by the reefs every day in the wild. A lot. But still, the water quality is good. So, I figure that's my goal: Find ways to feed as much as possible and still maintain good water quality.
Towards that end, I only feed normally small or well-blenderized foods (except for nori sheets) so that any extras can be quickly processed by the micro- and near-micro-fauna. I feed larger animals by giving them the unmelted versions of frozen foods, so that they can chew off what they need. I rely heavily on populations of small animals to clean up waste food, break the food down further for bacterial processing, and also to bind nutrients up into their little bodies. I also rely on large refugiums and making them good places for algae to live so that the display tank will eventually (and it's looking pretty good these days) be fairly clear of algae and so that nutrients can get bound up into algal biomass, too. Plus, big skimmers and easy water changes.
But, I feed the rough equivalent of 40-50 cubes of frozen food per day among all of the tanks, plus algae sheets for grazing. I checked the nitrate last week: 0.
Why is it zero with all of the food input? Because the nutrients move through the various stages of breakdown quickly and any by-products get sucked up very quickly by the algae.
So, that's my story. It's not a method that you'll find advocated by many, but it's what I do. The good side-effect is that the animals have tons of spare energy that they can use for gamete production.