Since I moved it and put up the post about having weird water parameters I haven't gotten rid of the algae in the thing. . . It's been covered in hair algae for a looong time now

I've still been wondering what to do when we move next May, and I think I'm going to just downgrade the tank instead of trying to get it back in shape and then having to tear it apart and go through this again in 6 months or so(plus I have a mold outbreak behind my bed that I am worried will make me and the bird sick, and the only way to move the bed is to put it where the tanks are. . . Which means moving the tank again, and since that got me an algae outbreak the first time >.<) I found a build on RC for a 5.5 AIO system that looks amazing, and am thinking about doing that with mine instead of keeping it as is. I've got a 5 gallon mini-bow that I can use for it(really would rather have the 5.5 like he did, but since I already have a 5 mini-bow and can't seem to sell it even for cheap with all the parts, why not just use it, right?), get a 36 watt Coralife PC(should be plenty of light, right?) and use my 160 gph powerhead from my current tank on it. My montipora died(got knocked over again and I didn't realise it until it'd bleached out and it just never came back again) so all I've got is my zoas, one rock with rics, a small rock with GSP and a few LPS frags.
But what to do with the rock? All I really need is CLEAN rock to make the rock wall with(well, besides figuring out how to make the overflow area/return since I don't have a good way to drill the acrylic for the inside of it. Wonder if Home Depot or Lowe's will for me. . .) I'm going to take out anything from my 10 gallon that doesn't have coral growing on it and just keep up with the 10 trying to rid it of algae(I hope?) until then. (gonna try a different brand of distilled water, maybe that'll help. . .) How can I clean the rock though? Can I just(think I asked this here before) soak it in fresh(distilled) water until it isn't leeching ammonia anymore? That's really all I need, since it'll have to be dried out completely to make the rock wall and I don't really want to bother with cycling it after I make the wall and needing to re-cycle it when we move. I figer if that works, I can just get it to quit leeching and then not need to keep up two tanks and worry about less die-off when we leave, if that makes sense?
Is there some way to keep a lot of the life on it in my tank? I think I read of a way a long time ago about a way to get hitchhikers out of your rock and into a bucket so you can see what you do and don't want to keep to put back in the tank, but can't find that anymore. If I could get the critters(pods, worms and mini-stars) out into the tank somehow I'd really like that. Any ideas?