hello I recenly came across a bargain that included a 55 gallon tank, 2 powerheads, and two filters, and two lights all for 95 buckerooos. I recently started for the first time a 20 gal. sw tank and I know how fAIRLY EXPENSIVE THAT IS. here is all the equipment I have including the stuff from the 20 gallon- 4 filters, 3 powerheads, 3 lights, and two heaters. so what else do I really need to start a reef? I know I will maybe need some special lights but what else? and how much may it cost.