Brad,
I had a hard time understanding your post because of all the typos
Would like to offer some opinions, but am not sure exactly what you are talking about, other than you have algae problems, need to clean the rock, want to build new sump/refug, want to move the 75g to another wall. Do I have the gist of your post? Is there more I need to know before offering opinions?
Ahh, I'll offer a few opinions anyway since I am cleaning up some cyano and algae problems currently
I would find out the source of your algae problems before cleaning the rock. Whatever you clean off will probably grow back fairly quickly anyway. Things I would check are nitrate, phosphate, alkalinity, calcium levels. Also, when was the last time you changed your lights? How much LR do you have and what kind of clean up crew do you have and how many of them do you have? How often do you do water changes? How much water each time? How many fish and what speices are they? Is there leftover food when you feed?
Solutions we have used to get rid of cyano and algae in our 120g tank are:
- changed the lights. Under the new lights, the cyano started to go away, leaving green algae underneath. The old lights were at least 1.5 years old and should be changed at least once yearly
- changed filters immediately in our RO/DI unit when we found .5 ppm ammonia coming out of the unit
- bought a whole load of snails to work on the green algae that had been growing under the cyano
- am doing weekly 30-40% water changes for the next while, rather than the weekly 15%
- added calcium and magnesium
- have tested alkalinity and adjusted it. Am also now dripping kalk daily to maintain alk and calcium