well, it's been about six months since i installed my first water cooling setup. after the first month without the little green ones, i assumed (falsely) that anti-algae tabs were not needed and the small amout of water wetter would keep them at bay. i have no internal case lights, and the only light the inside of the case receives is from the rear fan openings. i guess that was enough.... well then, they don't seem to like the res because they are not growing on the walls there. however, they've taken up residence in the danger den tubing. i guess it's time to clean. maybe this is a good time to upgrade while i've got everything apart......