What sort of cover should I use?

[Kryos]

Originally Posted by gregzz4

You will get all kinds of arguements about lighting blockage etc, but pound for pound, I'll choose eggcrate
It's so easy to work with, no frames needed, can be trimmed as required, cheap to replace, etc etc, ....

this, I agree with, which is why I still use it with my 5g despite the grid shadow. (which you won't see on a tank with T5s)

What you could do is put egg crate on top of your tank as the rigid frame, then place something else on top of the egg crate to stop jumpers in their path. Of course, that's more money in it and will probably block even more light.