After years of trying to get lower level lush grasses to grow like a thick carpet, I'm finally thinking of going Metal Halide. I've been running a Coralife power compact with 2 x 65w 6700 and 2x65w 10,000 on my 72 gallon bowfront and I feel the tank is just too deep to get the bottom plants growing like you see in the books. I inject C02. I've tried long lighting times and shorter. Not sure what else to do. Can anyone recommned fixtures and bulbs for this size tank in Metal Halide?