indoor pond

Finished my pond for my banded bamboo sharks and for the last 3 weeks haven't figured out how I want to plumb it..should I put a pump in the pond to go over the side into a sump and another pumping water into the pond or should I drill bulkheads into the liner?

So ever since I got into fish keeping my favorite fish has always been the sturgeon but I never was fond of an outdoor ponds because of being harder to see it and for 3-4 months of the year being frozen.. I recently realized I could keep one in an indoor pond and was wondering what size I would...