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I have decided to do away with my stock canopy and upgrade my lighting on my planted tanks and i will be getting glass lids made. My lighting will be a 2x54w t5ho. I need lids in winter because its so dry here that i am having to top up my tank every couple days as i am losing water at a rate of about a gallon a day.

The lid will be made of 2 pieces and will not be hinged so the 2 will basically butt up against each other supported on the ends. My question is what glass thickness would be suitable for a length spanning 47 inches x 6 inches wide the other will be. 47 x 9.25 inches. Should i go with 5mm glass and will that affect the light getting through the glass? Would 4mm be sufficient and not sag in the middle?

What do you think?
 

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The light will defenetly be afected, depends on how clean the glass will be on the top. But i think it is not to be problematic.

You could put support glass parts on the top, to prevent glass curving.

Sorry for my english, i hope you understand me.

Sent from my GT-I9100 using Tapatalk 2
 

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I just got 6mm thick lids made for my tank and visibly I don't notice a difference. The length is 22" and width is about 7", and they don't budge when my 10 pound Bengal cats jump on them.
 

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I use 1/4 inch glass, so about 6mm or so. Don't notice any light penetration issues provided the glass is clean. 5mm should be ok is my guess. 4mm....look, I've broken a couple of really thin cover slips, which isn't hard to do when you have to take the slips off to get into the tank.
 
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