What exactly do you mean by an ATO reservoir? A place to hold water for top-up? remember you've only got 38g to work with
I'm assuming space is critical if your trying to get all this stuffed in a 38 gal tank
I've built around a 45g sump that would fit those dimensions but it took a almost a full sheet of 3/8, price that and it's not really worth the hassle IMO
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Romeo
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