DIY acrylic lid, final answer!

[MrMuggles]

I finally got my hands on some .22 inch Optix brand acrylic sheets, and attached some 3D printed tabs with super glue, these allow the lids to rest on my tanks bracing. Some extra printed pieces act as a channel guide and a handle for the lid that rests on top

at this thickness there’s no sag, these are quite rigid

the sheets came in 18x24 precut which made them a perfect fit for my bracing with no adjustments.

 

[Desertdame]

I finally got my hands on some .22 inch Optix brand acrylic sheets, and attached some 3D printed tabs with super glue, these allow the lids to rest on my tanks bracing. Some extra printed pieces act as a channel guide and a handle for the lid that rests on top

at this thickness there’s no sag, these are quite rigid

the sheets came in 18x24 precut which made them a perfect fit for my bracing with no adjustments.

That's a great idea! I've been looking for something to cover my fluval spec 3's hole in the middle that won't block the light or reduce the air exchange at the top of the tank. Brackets will work perfectly! Ty for sharing!

 

[BunnieWarren]

It looks so professional, hard to believe that's homemade! Good job.

 

[MrMuggles]

won't block the light or reduce the air exchange

I really got lucky that lowes had sheets in ideal dimensions, the gaps were perfect

 

[Desertdame]

I really got lucky that lowes had sheets in ideal dimensions, the gaps were perfect

Yep. I'll have to find someplace that will be willing to cut it for me. I think I found a place online that actually makes and sells plastic sheets. I don't know if they'll just sell and cut me one only. They appear to be manufactures, but I'm not sure. They claim to have 50 locations in the United States. Their site advertises any size, any quantity. I think I'm gonna test that claim. They'll probably charge me up the wazoo though. We'll see.