Can you give us more information about the size of your tank, is it reef, FOWLR or fish only, and what exactly are you using for lighting? If you have a reef tank, you may not have very strong lighting and I would leave your PC's on for 10-12 hours. If you have a fish only system and algae is a problem run your main PC's for less (6-8 hours). The actinics give the tank a nice look and don't usually contribute to nuisance algae so you can leave them on as long as you like. I would still turn them off at night to simulate a natural day/night cycle.
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300 gal starphire custom built in pentagon reef (+90 gal sump on Blue Line 100 HD return pump, 210lb LR, Euro-Reef RC250 skimmer, 2x400W MH, 2x28W compacts, 2xTurbelle classic 4002 pumps & Turbelle Stream 6100 on 7095 Multicontroller, running ZEOvit)
Livestock
Fish: damsels; sailfin, yellow, regal & naso tangs; ocellaris & tomato clowns; lyretail anthias; foxface lo; flame angelfish
corals: a few
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