Glass tank solid cover

[Polyangler]

Do you need to secure the plexiglass (or whatever you use to cover the top) onto the screen cover to keep in the humidity, or just lay it on there?
Thanks,
HenryTheSnake​

The screen is secured, but the plexiglass is cut to the exact width of the screen and just lays on top. You could seal it in place on three sides, but leaving loose will allow you to lift, shift, or whatever to fine tune things.

If you're using a CHE, or heat lamp in a fixture similar to what you see in my pic, I'd have the plexiglass cut to about 2 inches from its edge. If you're using strictly UTH, then I'd cover the whole top, and drill a hole every day or so until you find the balance.

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