I had this red-ish algae growing on the back glass panel of my tank. I tried taking a picture but you cant tell its there since the back is black. It's on my 135 SA/CA community tank which has been set up for about 4 months now. I never had it on my 50 gallon which has been setup for about 2 years now. I scrubbed it off yesterday and threw in some algae control as well. Does anyone know if this red algae stuff is normal in relatively new tanks?