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I believe you can remove the top rim on the 40B and it'll be fine. Then you have a 40g rimless tank, drill add overflow, and bam. Custom tank for cheap.
I've read that as long as the glass is at least 1/4" and the rim didn't have a center brace then its ok. I'd probably euro brace it anyway.If u find any info tell me. I heard u need to euro brace
I've read that as long as the glass is at least 1/4" and the rim didn't have a center brace then its ok. I'd probably euro brace it anyway.

