I finally got my 155 gal double bow front and MANY thanks to World Down Under for all of there help, they are great!! I have 100lbs of live Tonga and Marshal Island rock in there now and going to get about 10-15 more tomorrow. My question is what should be the right about of rock and have read different opinions on leaving the lights on or off for a few weeks. Could someone please advise on the lights and amount of rock.