Dosing will be done to keep the plants in line, if I decide to go fishless, also the actinic wil be changed out for either 6700 or 10,000.i would think co2 and ferts would be real important. 10,000k and 12,000k actinic wouldn't be my first choice either. as for algae that will depend on if you meet the other demands of the plants too. without fish i'm assuming you'll be dosing extra n and p also to meet the demand.