I think I am gonna rearrange these tanks again. What I want most importantly is a carpet/lawn in these tanks and I don't think it is possible with all the stem plants competing for C02. I don't plan on using any C02 in either tank. I will use excel and DIY C02 just to boost growth, but after that I am stopping it. And I also don't plan to do water changes.
I think I will put all these other plants in my 20 long and use a DIY C02 and dose ferts. Only thing is the substrate is play sand and it has a single T8 fixture on it. I was thinking of getting (2) CFL clamp lamps and using that instead. Because one problem is that t only lights the back and middle part of the tank, the front doesn't get much.