0.5 cm thick aquarium lid, will 3/16" plastic backstrip be fine?

[ihateSpirorbids]

I have an aquarium lid that is 0.5 cm thick. There's a gap between the lid and the aquarium rim, which may allow fish to jump out. I want to get a plastic backstrip for it, but most products don't match exactly 0.5 cm.

The largest one I found is 3/16" (inches) from here: Backstrip from Amazon

3/16" = 0.47625 cm, so slightly under the 0.5 cm thickness of my lid. Does any one have experience with fitting 0.5 cm lids with 3/16" plastic?

If not, looking for ideas on how to block the empty space, if anyone has any. I tried saran wrap, but it's such a pain to have it be consistent, especially if I move the lid for cleaning or something.

 

[Saltyreef]

You might need a hairdryer and some pliers or flatblade to openup the slip on portion a bit wider.

The opening is .1875" wide and your glass is .196" thick.

good luck!