Get rid of the lights. They are not necessary and will just suck humidity out of the enclosure. The flexwatt or RHP (whichever you choose) should be enough to heat the enclosure. If your home (or at least the room where the enclosure will be) is at or around 70-74, that heat source will be more than adequate. A fan is not necessary either. Boas need a cool side and a hotspot to thermoregulate. They need that gradient in temperature. Keep it simple!!
RHPs are fine and I love mine for my GTPs. But I do prefer belly heat for my boas. I think they benefit from that more when they are digesting.
I also keep my babies in tubs. Very young babies are in 32qt until they are about 8-ish months old, then they go to 41qt until they are about 2yrs old. Then they go in their adult enclosures. But if you clutter up your enclosure with lots of hides, even babies can do fine in something large. They are not ball pythons, lol.![]()