if it ever does matter, no need to waste money on aquarium glue, the sealer I recommended does the same stuff, and is much much cheaper, and you get a lot more (its just a window and door sealer, but does the job, I and many others I know of have used it before, never had a problem)
Good luck keeping those temps constant, and on the warm side, I imagine its hard esp. w/a high maybe try putting insulation on the sides, and if you have a mesh top cover most of it, so not all the warm air can escape, I used aluminum foil, shiny side down and it helped, as well as helping keep the humidity. Also, are you using a thermostat to help you maintain a constant temp? If not, I recommend using that as well.