Starting a 55gal. Will be using 4ea. 48" t12's over the tank and planting it. Got one bag of eco-complete and was wondering if I could mix it with gravel and grow plants decently. Wanting to grow fine grass like plants in the middle to have a solid blanket of green and bushier plants on each side. Do I need more eco-complete? Kinda on a budget and this stuff is priced like gold Thanks for info.