Sand vs. Gravel
I'm new to the planted tank scene but I've enjoyed learning everything I can about it. Which type of substrate is usually better for plants: sand or gravel? I plan on starting a new planted tank and am thinking of laying down a layer of gravel over a layer of sand. Could this possibly work? If so, what type of sand should I use? Do I have to use what's sold in pet stores, or is there a cheaper option? TIA for any replies.