frankly speaking.....my tank is only one month.....but i intend to buy a chiller first...then a mh.....then i will add in mushrooms first...then sps...but i might not have enough fund so can anyone help me to find 2nd hand products??? ThAnKs if anyone will help me.....BTW can anyone teach me how to save on the unnecessary things....and for ur info , i haven bought anything but a tank, live rocks, and pump.....(intend to build a sump, but dunno wat to buy first)...my budget is only 2k , tt all i can afford...thanks.....