So I did it. I bought 6 Sterbai Cory's and today I ripped my 75g apart for them. I took out all of the eco complete (which was in there for 3 years, what a MESS) and then I put play sand in instead. I put my new driftwood in and then I replanted everything. The water seems to be clearing up really well and I've already put everyone back into the tank. The cory's are loving the sand! It looks as though their color even changed when they went back in. The look darker against the play sand. I had to aquascape blindly because the water was so cloudy I couldn't see what I was doing. My crypts will have a major melt down, but tomorrow I'll put root tabs in. I even did an area of rocks for the cory's. I hope they appreciate my efforts!