So, in my search for a proper heating system, I think I have an idea. Since my tank is large (55) and the top has two sections...I was thinking that I could keep a screen over the warm side with a lamp over it. I would keep the plexiglass over the cool side. Since humidity is no problem, the screen wouldn't do much damage there. I know under belly heat is preferable, but I don't have work until deeper into spring (I train horses). Please and thank you.