I want to make my biocube 29 into a reef tank with mostly softies, 2 LPS, and one derasa clam. ( don't tell me the clam will outgrow the tank because I know) Will I need to dose anything like calcium, or will the clam be fine without? I will have a chaeto refugium in the second chamber of the sump, and I will not be running a protein skimmer, but I will do a 5 gallon water change every other week. Thanks.