The way i see it right now, your light maybe the most limiting factor, being that if i'm not mistaken, T12 lights put out the least amount of light from T12 - T5, although to compensate you maybe able to leave them on longer, since i do that on my 60G tank which has T8 ballast fixed into the hood...
As for plants, depending what look you are after, anubias sp come in a lot of different shapes and sizes, and if planned well, i've seen some amazing scapes using just different species of anubias... These will be the easiest plant to work with as they are a low light plant that is very hardy and doesnt really require extra ferts to grow...
Then you have different mosses, some which grow more slowly, some that grow like weeds, again, depending on the look you are after, most mosses do pretty well in low light tanks...
Last but not least, there are also java ferns and crypts that you could also consider...
All these plants above do not require Co2, and are pretty good beginner plants to start with and see how you like it before moving on to the more tricky plants...
But do note that dosing with something like say seachem excel and flourish or root tabs should help the plants grow healthier...
Eitherway, that was just a very basic list, as i'm sure there are still quite a few plants that are probably not too hard for someone new to planted tanks
Oh and let me end by saying patience really is key with planted tanks
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