Thanks everyone for all the great info.. Mike.. I bumped the temp to 85 and will do 25% changes 2-3 times per week. So far its nightcrawlers twice a day, silversides twice a day and Hikari pellets throughout. I just got this batch of rays in and am trying to fatten them up, and I appreciate all you guys help. Keep it comin.. any comments on best filtration, Im runnin 3 emperor 400 bio wheels on my 150gallon, but just bought 15 new tanks, 40 gallon wides and 75 gallon wides, and am about to have to set each up with proper filtration.. ANy ideas/comments?? Thanks again in advance, NIck