The tanks look good Mark! The 90g (first pic) looks really bright for a shoplight! The only thing I would change about any of the tanks is to get more plants in there
As far as the Excel dosing, Vals, Anacharis, and something else I can't think of right now are sensitive to Excel and sometimes melt. I would stop the Excel on tanks with either of those plants. The Vals should do fine without the addition of Excel. If you like the look of the tall grassy type plants, look into some Cryptocoryne retrospiralis or C. crispatula balansae. They will do OK with Excel then you can put all the Vals in one tank and not have the need to dose Excel.