Yeah, most soft corals and polyps should be okay anywhere in your tank. If your gunna try any more light demanding corals id put them up high near the lights. Now for clams, that can be debatable. Some will say you can keep squamosa clams if there up high. Some say no clams unless you have a MH. I myself have seen quiet a few ppl keep a Derasa and a squamosa clams in a 55 gallon with 65x4 of PC (260watts) for years and they are doing fine. Im gunna try to keep one myself once my tank is mature enough to handle one (8-12 months).