Emrald crabs and Mexican Turbo Snails will do the trick. When my tank was first set up, the addition of a few of these had my tank clenaed up in no time. The crabs and snails will clean up the algae, but you need to determine why you have it in the first place.
How old is the tank?
What type of water are youi using?
I feel your pain moongoddess. I am suffering from about of it as well. Fox Face, algae blennies yellow tang nothing is working I also have changed the lighting and done water changes. I am getting ready to hit with a chemical I will keep you informed of the results
Try a phosphate remover. Then maybe some carbon. You might try scrubing the rocks with a stiff bristle toothbrush. If you cant take out the rocks, scrub in the tank and siphon out the scrubbed off stuff.
Ive had that problem and I got a foxface and he mowed down the LARGE infestation of algea I had in about a week!!! Now some fox's will and some will not, its worth a shot the least that will happen will be having a new cool fish!!!Actually now that I think of it my 2 tangs also ate alot of it as well...thats my .2cents