okay, time to call in the OTG professionals; be ye a-listenin???
What you NEED to do is make the whole pond experience into something OTHER than about the pond. So, for instance, and knowing very little about you, consider what your sponsor likes, turn it more toward that. Find ANY common 'like' with ponding, and use it. Make it festive, make the experience of actually BEING by the pond some thing fun. Something your sponsor looks forward to doing again. Whatever it is. Slowly, surely, you'll win them over, maybe not into ponding proper as you appear to be, but to the time you spend there. My wife is TOTALLY not into any of my filter, building, tweaking talks; her eyes glaze over, but what I do is make the time on the patio fun, AND I talk fish etc in an off hand manner (when I think of it!). We have drinks, play card games, watch movies, make notes on various parts we BOTH like, etc. It IS good 'my' sponsor likes flowers, so I make sure the plants I put in the pondhouse have flowers and are not just for texture! Surprisingly, she likes the frogs--go figure--and I had HER name the ones we'd see most often. Stuff like that, keeps her invested and interested. I put an audio system by the pond/patio, this creates a different atmosphere for her, too. Wind chimes, does your sponsor like wind chimes? You have to LOOK for 'ins' to getting both of you into an area you're obviously more desiring!
It's like this; you want a new porsche, your significant other says 'no way', so you buy her a diamond ring, FIRST. Then the next time you notice a porsche on the streets, you sigh fondly. Get it?
Gals? Am I right? Guys? Care to chime in? We're having a group hug here, a real CAstle bonding experience...I NEEDS all the GPF help I can get!!!