I'll second Atlantis' and SeaSerpent's Comments!
Had the slime from hell infecting my tank for quite some time. I did everything I could think of - Added more snails and bugs, stopped feeding, massive water changes, new Membranes and filters in my RO/DI unit, everything! Still the slime lived. Phosphate kit's couldn't find anything, but yet obviously there was plenty there (as things were growing rather rapidly).
What (I think) finally kicked it, was getting my Alkalinity raised and stable. My Ca was nice and high, but Alk was pretty low. I was working on a Top off system at the time anyway, so I altered my plans to allow me to make a Neilsen Style Kalkwasser Reactor using a large bucket, PVC P-Trap, and a Dosing pump. Did a huge change, hooked up the Reactor, and that was the last I
saw of the slime. I'm not saying that it was strictly the Kalkwasser that did the trick, but anecdotal evidence suggests dosing Limewater will help precipitate out excessive Phosphate... I can't say that was the cure. All told I think it was a combination of better husbandry and maintenance (cleared up a lot of "dead spots" in the tank as well), fed less, and started making my own food too. I couldn't think of any nutritional value my critters were getting from "Gel Binder". I assumed then that this was going in as waste into the tank, further polluting things. The Kalkwasser Top Off got my Alk up there real fast, and kept it there; my Salinity was also much better regulated. So all told, I think it was a combination of factors, that finally kicked it for me.
Using Macro Algae didn't help get rid of the slime (have a 29 Gal Refugium w/ MH lighting), but I think it has had partial success in continuing to keep it at bay. If you don't have a dedicated area for your algae however, it can become a nuisance, so be careful before tossing a handful of Caulerpa in your reef.
- Mac