I'm setting up my 30g. next week and have 40 lbs. of Eco Complete substrate. However, it's black and I'm questioning black because it's so dark, and I don't know if I need it because I'll be planting just a few low light plants that cannot be buried in the substrate. So, any thoughts on just plain sand and how everything will do with that vs. the Eco Complete substrate (additionally, I am putting 78w. of T5 over the tank and do not want to use a co2 diffuser).