ive already got timers and a skimmer on the back, my tank is healthy and has a large amount of corals and others critters already. I just needed some ideas about how to get the alge back under control as i have exausted everything that has worked in the past. I would NEVER leave my lights on 24/7 for the simple fact of severe alge growth and no downtime for my tankmates, not even to mention the waste of power. In response to drinkingbird, i only have a arch eye hawkfish and a flame clown so i think they should be safe! Thanks for the info though i havent heard that the urchins would go after fish