I tried dosing, I tried presurized CO2. I didn't see much of a change in algae growth. I cut back my lighting period from 10hrs/day to 8hrs/day my algae growth slowed noticibly. My 2500G tank will be low tech with 4x 1000w MHs. I will start with 4 hrs per light per day. I'll run 4x 96w CF's about 8 hrs/day. 2 13w CF's will run 12hrs/day. 10 lunar lights will run when the 13w's turn off.