Ok, well my 75g has been established for a while and i have this stuff in my tank. It is algae but it is red and fuzzy, and REALLY hard to get rid off. What is my embalince. I know there is 1 but i cant find it. Should i step up on water changes. I am doing water changes once every 3 weeks (A combanation of being really busy and was lightly stocked for a long time). I cant figure it out. Any ideas? I have 2x t5hos for lighting.