I'm going to be trying my hand at a live plant tank for the 1st time in many, many years. I'm going to start out small and use a 10 gallon. I bought one of the AH Supply 2x13 retrofit kits along with 2 6700K bulbs. My question has to do with the substrate. I plan on using either Eco-Complete, laterite or flourite, but how much will I need? Also, what are good prices, both online and at my LFS? Thanks.