what you need is a hole at the top, so but some acrilic and extend the tank, the height only needs to be raised a few inches, make the extention fit snuggly to the outside of the tank and drill a hole in that fill in all the gaps with plenty of silicoln, then raise the tank fit a pipe in the hole so that it can overflow into the main display, if you keep this hole as close to the tank top as possible then there wil be very little (if any) pressure on the acrilic from the water.
john
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