I would not spray it
Chances are, sooner or later, he'll get too close/ between the lamp and reflector ( I'm assuming it's a T5)
It is too hot for them, the heat will take its toll and he will be no more
(Speaking from experience here)
I would first try to change the layout to a vertical up from the reservoir, the turn at the top of the cage. That will reduce one 90 elbow. 90''s are flow killers
If you could go with a larger pipe it would help too
I really need to get my act together and try to build one.
Materials are so inflated right now. Between the cost and the time needed to build, it is cheaper (at least for me) to overpay of the reptibreezes.:(
Check your favorite sites daily.
Maybe even twice a day.
The darned things are going for a premium right now.
Best bet is probably a local (i.e. non-chain) store in your area. I grabbed two larges last week from one of mine, none were available online.
I found two XL''s on Amazon a couple of...
I think it will be much easier on you (and the Lil guy) if you move him out of that cage for the time being.
A medium to large Sterilite container would make everything go smoother.
The are different ways to set it up. Check the forums, there are many examples.