I've just got an algae bloom and I haven't had one in ages. My tang and turbos and astreas usually take care of the little I do have. Could canisters getting old in my RO/DI be causing this? I have the wierdest thing. There is a patch of thick hair algae that no snails the tang or anything will touch. I've even tried starving the tang and he still won't touch it. Any ideas why?