Quick question about lighting

[megatron_55]

. . Hey guys just wondering . . to everyone who has a reef tank . . . How long do you guys leave your lights on??? (just got a new job and I'm trying to keep the lights on longer so I can see them when I get home from work!!) Is 12 hours too much?? I have a 27 gal. About 12 inches from light source to sand bed and I'm running 2x 96watt PC (1-96 true actinic and 1-daylight 10000k approx. 7.2 watts/ gal) Let me know! Thanks . .

Just wondering coz I don't want any algae bloom . . .