Fish, in aquariums. Lydy's aquariums, to be precise.
This is our first try at using the studio strobes for this. I'm finding it's hard to position them well; the fish tend to end up somewhat backlit. Also, I'm getting a lot of glare spots and flare circles off what I think are particles suspended in the water (many edited out of the versions presented here). It's already been interesting, and I'm sure there's more to come.