Ok I have no idea where this stuff is coming from, but I'm getting some massive hair algae starting in my tank (well it's been going for a little while now). Does it make sense that I have the hair algae but not a major film algae problem on my glass? There are a number of things that I've done lately that may be causing this....I traded in rock to LFS for new rock (perhaps it is sheding detritus), I had to remove some flow due to lack of space for the closed loop pump (I may be able to add it back, not sure), and who knows what else. It also seems to be catching additional detrius which is probably fueling the growth even more as I syphon it out of the corner that it usually collects in. Any BBers out there ever have a hair algae problem and what solved the issue? Thanks.