I have a low tech tank with aquarium gravel and dose excel. Plants do grow. But not all of them. I have, over time, added some of the Schultz Pond substrate to give a little extra boost when plants started to do very poorly.
Now I can't imgaine you would want to do gravel with a high light Co2 tank, but I don't know much about that
I'm using crypt wendtii bronze for my front plants. And have a large amazon sword for my background plant. I considered maybe switching to eco complete but very expensive and just scaped the tank the way I want it. And I've been using the seachem root tabs
I got a whole bunch of gift cards for Christmas, including Petco, which was pretty sweet considering they have Eco-complete for 20 bucks a bag on their website, is it worth it though? Is it something that crypts would benefit from greatly? or would it be just about the same using regular gravel with root tabs?