I've never had a planted tank before so I could use some help. I have a 150g that I would like to put some plants in. My wife loves the carpeted look in tanks she's seen online so I was wondering if their are any low light carpet plants? Would dwarf hairgrass work? I can add some DIY Co2 if needed so that doesn't matter. Would a pad of moss grow out and cover a terracotta house if I tied it on top of it? One last thing about the carpet, I have sand in the tank so what can I do about that? I want to leave the sand, so can I just try to add some stuff to it w/o draining the tank? Thanks.