Okay up about a month now. Time to get down to it. IMO you need to be aggressive the the hair algae outbreak you are experiencing. Manual removal (should never have hair algae growing on your magfloat). I do mean aggressive manual removal. get as much as you can out of there if it takes you a couple of hours to do so. Increase your water changes and filter material changes to every three days or so. If you have a skimmer run it wet and empty the collection cup often. You must get the nutrient that is there from the die off on your rocks out of the tank. I did not read back through the whole thread but if you are using tap water stop it now. Get some RODI from you LFS or distilled from the grocery store.
You must be diligent now, let me say that again, you must be diligent now or this problem (which I believe is on the verge of getting away from you) will be a continuing escalating problem.
Please take this for what it is a warning of dire consequenses to come if you do not get on top of it now. I have seen many threads that the poster has gotten so fed up with hair algae that they have either quit or taken the tank down, cooked the rock and started over and I would hate to see you end up there.