I currently have an AIO rsm250 with a HOB reef octopus bh-2000. Buddy of mine is offering me a 75 gallon with a 10 g sump for next to nothing. I have a bad GHA problem i lowered phos to .13 a lot of my rock has the green fuzz. Now my question when I go to transfer everything is it relatively safe to scrub all the rock down? Or will it do more harm than good?


