When the macro algae in your refugium doubles in size, take out a third of it and throw it away. Keep it pruned back enough that is has room to flourish. There is this guy I know in Cedar Rapids that has some kind of phobia about pruning back his macros, everytime I looked at his refugium it was choking itself out it was so full of caulerpa. You can either throw it in the trash (makes your trash stinky), compost it (what I do but I think you live in a apartment so I doubt you can do that) or flush it down the toilet.
I think near the coast people say you shouldn't flush it for fear of having it get into the sea, but I don't think we have that worry where we live, so flush away.
I can probably come over sometime soon, I will make those frags for you and give you a call when they are ready, I ended up being more busy this weekend than I had planned.
I think your red slime algae problem should clear up soon, with all the good changes you are making, the new RO unit and the refugium.
You will like the Gulf View rock, that is the kind of rock I got recently, some neat critters came out of it. I did find a mantis, the one I have in the 5 gallon in my living room. He wasn't really hard to remove though, I just
saw which rock he was in and took it out and now he is my little pet.