Questions - Need some input

I have thin yellowish brown hard bristles growing out of rock . Looks like a old toothbrush bristles

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I'm building my sump and wanted some ideas from y'all! Its a 20 gallon high. Will have three compartments. Fuge will be the smallest because of availibility of space. I want the return bigger so my heater can fit in the space. The tape in bottom of tank shows where I was thinking of putting baffles. What ya think? I will have 2 returns whereas the skimmer section will get 3/4 of water from return and the fuge will get 1/2 water. Heres pic:

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When i first got this frag it stayed open and was healthy looking then it started shrinking up. I thought it was just shedding and it seem to be but its been closed up for a month now opening part way for a few days every ten days or so. All my sps, lps, shrooms and gsp are growing and have full polyp extension. I have tryed moveing it around in the tank with no great results, It is bigger then when i got it with more branches but stays drawed up. There is no ...

can someone id this stuff. This is in my cube and I was wanting to move all of the rock out it into my 135 but this stuff seems invasive. Is it good or bad?
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Thanks

New guy here getting addicted to the reef culture. I have kept different FOWLR tanks over the past 7 or 8 years. (not very successfully due to lack of funds ). I am currently in the beginning stages of setting up a 135 that I just moved into our new house and thought I would share my successes and failures as I go along and hopefully your guys input can help me along.

So Far this is what I have running:
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