I have a 120gal mainly reef tank that was overrun by Hair algae. (Had the aquarium for about 7 years.)Eventually, we "killed" the tank by leaving the lights off for 6 months and starting over with removing all rock, cleaning rock with fresh water, new sand, all new water, and then letting tank cycle through the amonia, nitrates, nitrates, etc. Of course, this took several weeks. Tank looked good and stable. Added 1 xenia and 1 toadstool. Looked good. Added 1 pair picasso clowns. Still looked good. Hair algae started coming back. Water tests look good. The wife is feeding the clowns 2 times a day. (Just a "pinch") Is this too often, and if so--could it be contributing to the algae. We have about 35 hermits and 2 emerald crabs for cleaners. ALL help would be appreciated. I hate the hair algae.