i just ordered another cheap one off of amazon this time and i threw it in the sump. 9w chinese $30 whatever it is. its suppose to work upright but i could only fit it almost horizontal almost, but it wont work if the bottom is higher than the top. so far so good. got some suction cups on it and i added some to keep it from floating up.
on another note, today i had my first good cleaning of the turf scrubber, not sure if i mentioned but i added a second light to one side and there was a good difference. So gonna look into more powerful par38s, cuz if i try to put 4 lights down there it aint gonna really work well without being a hassle.
also going for more flow, laminar gyre flow i guess its called. so not really random flow its about moving the whole tank water as a whole. basically one powerhead towards the top of the tank on one side and one on the other side towards the bottom. easier to do this with no sand. lol , technically if you can move more water this way with the same pumps. think vertex circular motion.
I also purchased some aquavitro fuel since i keep hearing good things about it. New test kit for mag, alk and cal, im rockin and rollin right now !!