Hi guys i need some help stating a reef tank. I have a 30 gallon hex tank that i would like to set up but i dont know much about the hobby, just from what i read in books. I have a filter and protein skimmer already from a 120 gal sw fish tank. N e advice or info would be great. I just dont understand the "parameters" for keeping water. i no about the live rock n sand i have a ro water filter set up so thats not a prob.