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There are a ton of 36 inch hoods available. I have found nothing that fits the 18 inch depth of a 40b though so it would have a gap you would have to fill, even tried searching for a 65 gallon (which is the same footprint).
Thank you for the link, I'll make sure to look into that tomorrow when I'm on lunch... I appreciate the assistance with this I'm excited to start this new chapter in fish keeping