My office has zero natural light. I wanted to put in a koi pond, but I understand they really benefit from natural light. Are there other options for ponds... fish, turtles, etc or other artificial lighting options?
I'd probably go out and have three - four contractors come in and give a quote. Ask them for lighting recommendations, size and materials for the pond, etc. You might find that it's better overall to get someone else to build it, but worse case, you get some free ideas on how much lighting you will need.