Devilishturtles
Aquarium Advice Addict
Hey Mike. To answer Question 1, there is a seller on ebay named 'filterdirect'. Everyone pretty much reccomends RO/DI units by them. They are a good value and a quality product. Check it out. Bout the sump, I can't really help you besides to mention ebay and aquabid. A Ca and PO4 kit would be ideal, yes, although usually they aren't a problem. I like to keep flake food on hand at all times. I occasionaly switch up between that and frozen with my fish. I wouldn't advise buying frozen food online, for obvious reasons. IMHO, you don't need a calcium reactor. Most salt brands buffer Ca right to the correct levels. The only way you'd need a reactor would be if you had a tank VERY heavy in sps and lps corals that utilized alot of it. Do regular water changes and you will be just fine.
HTH
HTH