I am the one that was on the verge of giving up because of my hair alge problem. I stopped using the Calligan water from walmart and have seen a very slight slowing in growth. I just found out there is a product called Marine SAT from TLC that is supposed to "drop" the hair alge from the rock within an hour of application. The claim also said it won't hurt any other alge, inverts, or fish. I'm very sceptical about the stuff. Any one heard of it? Let me know.