Tank lid help

[CaseyCase04]

I have a 40 gallon breeder fish tank for my crabs and have been having a lot of trouble with keeping the humidity in currently I have a wire mesh lid with a blanket over it I’m wanting to switch to a pexiglass lid but have no idea how many holes it needs for air filtration


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[emayers]

There should be enough "fresh" air when you open the lid to add food or water. Also, our tanks are not usually air tight and will allow a slow exchange of air. If in doubt, add a couple small holes that you can plug or cover to help with temp and humidity as needed.

[CrabbyLover77]

Cover your mesh lid completely in plastic/saran wrap. That will keep the moisture in. A blanket is porous, and will absorb the moisture instead of keeping it in the tank.

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[curlysister]

I have a plexi glass lid with one corner cut out of the plexiglass to allow air flow. The corner isn't huge, like maybe 2 or 3 inches on each side.

[wodesorel]

And a thinner sheet of plexi (which is cheaper) can be used overtop the screen lid so it's still secure so the crabs don't escape!