You have similar lighting to what I use in my 75 gallon. I've been told the dual T5HO fixtures are actually medium to high lighting. These are the non-green plants I've been keeping so far successfully without CO2
, just dosing Excel on water changes:
Sunset Hygro (Hygrophila Polysperma var Rosenervig, gorgeous pink top leaves with white veining, illegal to ship across state lines but you can get from in-state traders)
Ceylon Hygro (Hygrophila Polysperma var Ceylon, coppery red leaves, illegal to ship across state lines but you can get from in-state traders)
Red Cabomba (Cabomba Furcata, fine leaves that range from coppery to pink, grows like crazy)
Narrow Leaf Ludwigia (Ludwigia Repens x Arcuata, green leaves with pink undersides)
Red Tiger Lotus (Nymphaea lotus 'Red', big red lily leaves, trim the long runner leaves if you don't want it growing on the surface)
All of these appreciate iron supplements to really bring out their color. Hope this helps!