HOLY COW!! This sounds like more work than I wanted just for an excuse to use something that has been sitting in storage for a couple years.
Maybe I'll just buy some pretty blue glass beads and put some fake flowers in the bowl...
Thanks for all the detailed input.
Looks like we have a few future marine biologists in our ranks here.
I'll decide what to do over the break the next few days, and go from there and keep everyone posted. I just cleaned the bowl today, so if I do something, I want to do it soon so it doesn't get dirty just sitting there.