Dosing minerals depends on the load your corals have. Let me rephrase that.. LPS, SPS use calcium along with other minerals. If you aren't doing water changes with GREAT frequency, they will suck all the minerals they need out of the water. Thus creating the necessity to dose. Salt has all the necessary minerals, but not enough to sustain an infinite number of corals indefinitely.

For me, I have a lot of hard corals. Stuff that really sucks up the Calcium in a hurry. (My clam is giant). I am going to get a calcium reactor when I can afford one. Right now, I dose Calcium every other day at 2 tablespoons of the seachem stuff.

With a fuge, you will have macro algae (I assume) that will suck up some of the waste nutrients.. I run mine on reverse lighting, to help keep the pH in balance. I have never ran carbon, nor any phosban, and I have very minimal algae on my glass. my CuC is amazing. 3 turbos, 5 nasarrius, 20 blue leg hermits, 2 skunk cleaner shrimp, 1 spiny urchin, 2 florida fighting conchs, 1 brown brittle star, 1 sand sifting star, 10 Cerith snails, and 10 margarita snails. They all work their little butts off to help me not have to clean so much.