I was thinking that.. I do have the t5's.
And they're not getting "directly" under the mvb. They are ALL basking 4" across from it.
My temps are 100f(floor)-105f(raised bask) hot and 80f
Maybe too much UVB in the zone?
I have recently put my guys in this.. They are not eating as I would like but put it down to settling and bulbs burning in.