I've fallen in love with black substrate and contemplating switching my playsand for black. I have a 36g bowfront with an aquaticlife twin t5ho fixture, fixture is newish so these are my backbone. Currently have swords, crypts, tiger lotus, onion plant and anubias, all of which are thriving. I wouldn't mind replacing the anubias, or atleast most of them with some type short ground cover but haven't loked into that as of yet. Current ferts are excel, flourish, and root tabs but may switch to dry ferts when flourish is gone. With my current fixture I'm under the impression that CO2 wouldn't yield that great of return so I'm currently not interested but open to it in the future if I am convinced it is worth the cost when coupled with my lighting. So there is where I'm at and where I want to go, based on this are ADA substrates worth the cost or is black diamond a better option based on my needs?