Gravity and the overflow

dive girl

Member
I have a sump on one of my seahorse tanks. I want to upgrade the sump. I currently have two options.
I have a 20g sump that I'm not using that I could put behind it on the floor and use.
or
(My first choice) I could use a 30g tank and stand I have but none of these tanks are drilled so I'd need to use a HOB overflow. Is there anyway to do this when using tanks that are the same height? Since an overflow uses gravity to put water into the sump, I can't think of another option where I could use a tank that is the same height as my display.
I thought I'd come to the guru's to see if there is a way.
Thanks.
 
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