I think I finally sealed all the leaks in the first of my pondquariums, though I'll need to mark the water level and wait a day or two to be sure. If it's watertight, I'll drain it so that I can install a newt-proof overhang around the edge and bird-proof netting over the top of it before refilling it for the last time. My second pondquarium is also nearly complete, but I need to wait for some more sealant to arrive and for several days of dry weather before I can finish it.