When I was a newbie I ordered some Marc Weiss Coral Vital. Took three weeks to arrive, and in the mean time I read a bit more of his advertising it sounded so outlandish, decided it had to be a load of bull, so put the stuff in the cupboard and left it there.
Anyhow, curiosity eventually got the better of me, and I decided to try it. Well, believe it or not, it does seem to work. Not to the extent the advertising says, however my corals are growing faster, and polyps opening more. Still not convinced this is all not just coincidence, so I will finish the bottle, and then not use it. I want to see if coral growth will slow back down. If it does slow down I may get another bottle.