That is T5 clearly, and the HO means High Output so presumably the tubes in there are such. Now that we know this, I would suspect the Anubias problem was too much light. Anubias is a shade plant, and when grown under direct lighting and especially when as intense as here, it often does not fare well. Sometimes brush algae attacks it and fairly quickly suffocates each leaf. But other issues can occur too, due to the light being greater than what the plant requires. I suppose one could say it sort of just burns out.
Knowing the fixture now, if you remove the tubes there is bound to be something written at one end. But that aside, these tubes need replacing regularly as they weaken with use. I use T8 myself and find they last from 12 to 18 months (the "Glo" ones). T5 I did try once for a week, but took it back as it was way too much light; I was expecting my poor fish to be asking for sunglasses.
I believe I have read that they too need similar replacement.
As for the tubes themselves, one I would suggest should be a Life-Glo. For the second, you can mix if you like, or stay with another LG.
You mentioned looking into CO2, and with this much light you could have diffused CO2. Before deciding on this, decide what sort of planted tank you want. I don't know your level of knowledge/experience, so to be very general you can have low-tech with low and moderate light requiring plants [some floating plants would reduce the brightness of this T5 HO, or perhaps you can remove a tube and use one?] for which CO2 would be un-necessary, up to high-tech using CO2 and higher-light requiring plants.
Byron.
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