Originally Posted by Gregcoyote
They are uncanny in their accuracy. I've had fish jump thru holes just barely bigger than they were. I take it as a insult from the fish...but I digress. I would fasten some pieces of mesh over any hole you can. You want the top to breath and not block precious light energy, that's why I use the BRS mesh.
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^ This ^
And marine tanks need to off gas and glass lids can cause ph swings in some cases.
My wrasses made it out eventually.