How high can bettas jump?

If you don't want the tank to be too dark, you can get some plastic divider or mesh to cover the tank.

Just make sure the plastic is heavy enough and the holes are not too big.

Refer to the attached file.
Oh, yes.
Acrylic is a good idea. You can also buy from the fish store as the acrylic is used as fish tank divider.

Another option is glass. Some fish tanks come with glass for the top cover.
@PheonixKingZ they said here that they could buy the acrylic divider sold for a divider but use it as a lid lol
 

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