Yes, there's some gsa on the glass. but the ottos take care of most of it. very rarely do i use the magnet cleaner. no gsa on plants, but there is a little bba in the flame moss and on the stauro. the light is 4x24w, but one (KZ Fiji Purple) is just for effect, it doesn't help the plants much. It's placed first in the bank of tubes. So when viewing you look through purple first.