I have an extra 75 tank that I think I"m going to use to "grow" some LR so it's ready when I get my 180. I planned on putting about 20-30 lbs of LR in the tank and 75-100lbs or base rock. Will coraline spread if I just use some cheap shop lights? BTW, this is all that will be in the tank so I'll probably just keep it simple, just a heater and a couple ph's to move water.