I noticed a lot of cuttle and octo tanks have mainly macro algae in them. Well I wanted to have a reef with SPS/clams would it bother the cuttles any having corals instead of the algaes?

Well i know cuttelfish would be fine; actually Paradox keeps his cuttlefish in a full blown reef tank
EDIT** but I think generally you want to stay away from anemones and other stinging corals [like frogspawn]