and the DSB
is your filter.
Maybe people would be shocked at my systems when they see nothing attached to them other than lights and a heater and a pump.
So on my systems I run no external power filter and no skimmer. Now I have to admit I did put my prizm back on my 80 just this week after about 7 months of running it with no skimmer. But thats going to be a short lived event.
As far as your first question.
I feed the tank once every 2-3 days. I feed my tang daily with 1/4th of a nori sheet. THe sheets I have ar basicly 8"X10" in size so I go thru 1 1/2 of them a week on average. I have to admit also I have gone almost a week with out feeding my tanks (other than the nori). That nori is a daily ritual since the tang needs to graze almost all the time.
The less often you feed the less waste is produced.
our aquairum fish lead less active lives than their wild counterparts. Thus they need less to eat to maintain body weight and size. Our fish will also eat what they find on the bottom of the tank or in and round the rocks.