I was reading about screen material that can be used for acclimation purposes of new MH bulbs. Anyone have a pic of the stuff. Apparently can be bought at home depot. They also said cutting photo period by half is not as good , because if the coral is going to burn it will do so in the first few hrs. Is this correct? If it is I need some screen ! Just changed my bulbs as spectrum seems to have shifted. Cleaning algae off glass every 2 days. No thanks !!!