in the big aquarium. Lots of them still have hair algae. I cut the bright lights back half an hour. Some fine hair algae on the back glass, but it seems to only appear the day after a water change (and ferts dose- I'm still giving half dose of macros and no micros) and is not noticeable the day after that. I wonder if the fishes ate it? I see them nibbling on the edges of leaves but can't tell if they're picking off micro-organisms or eating the algae threads.