Just wonder with maybe adding that pvc pond liner or another puncture resisitant liner is this a cool indoor pond possibility? I saw it on ebay for 600 with free shipping. This portable holding tank feature easy assembly and disassemble. This free standing tank is ideal for shows, quarantine or temporary quarters. The material is extremely strong and completely fish friendly. Highly tear resistant. Technical Specifications:
Liner is UV resistant
PVC support legs
Thickness is approximately 0.6mm
2 holes: top hole is 3/4" and bottle is 3/4" comes with plugs Approximately 118" x 39.4" 1868gal
Here was some of that liner... 5' x 20' 20 mil PVC Koi Pond & Water Garden Liner
It is a pretty decent pond, for the price it is hard to beat. I went this route as it is a bit thicker than the cheap pools some people use. I've got four rays in the pond, I'm not too worried about leaks or anything. I will say the lack of a viewing window sucks. Also make sure to figure out a way to cover it, humidity gets really high without it covered.