<a href=showthread.php?s=&postid=10924898#post10924898 target=_blank>Originally posted</a> by shinosuke
Looks like hair algae to me, as well. Try pulling the big tufts of it out of the tank, then take a new, cheapo toothbrush and scrub as much off as you can. Be careful you don't grab something you don't mean to when you pull it out! With that much algae, there could easily be a sharp crab, snail, or any other thing hiding in there....
It may take a few scrubbings, but it will go away. Try to do more water changes, and if you're overfeeding, cut down on the food. Also, it could be from too long of a photoperiod.. try to keep your lights on a steady, 8 hour period, make sure your bulbs aren't worn out, and make sure you're not getting a lot of extra light from a window or other outside - light source.
Good luck!
~Adam D.