I like those tubs, but I have never considered doing a complete setup because I thought I would get annoyed taking the lid on and off, but I am interested to see how this turns out. The bulb will actually add a notable amount of heat to the setup in my experience. I haven't tried it on a tub, but in a glass setup it usually adds 2-3 degrees F or so.
I know the general recommendation on these forums is a minimum temperature of ~ 77 F, but if you can keep it above or at 74 or so, you should be fine. This is the beauty of a heat gradient and if you look at temperatures from (for example) Ghana you see that the average low across season is around 76-77, but does get down to 74 sometimes. You have both heat tape and a RHP, which gives you a great deal of control over the temperatures, so it may be a non-issue for you to get the temperatures you want.









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