What is the stand you are using for your T8s? I like it.
I have one T8 and another on the way. Absolutely love them! I do have heat tape in mine and it works fine, however if your room's temp fluctuates a lot and you are also using RHPs, you will have some problems with the RHPs overheating the hot spot when it's cold out. With stable temps, you only need one or the other, not both. If it goes from hot to cold often in your room, I'd just go with RHPs (usually just one mounted over the hot spot will do it).