Thanks to you both - each of those shrimp are really great, but after talking it over with hubby - we agree (that's rare enough!) that we want either the yellow ones or the orange bee's. But I do really thank you both. I'll edit the OP so that it is a little more exclusive now. Been spending a lot of time researching and looking at pics of the various types - and with our black gravel, the yellow or orange will really pop. It's for the office, so we want something bright and cheerful and easy to see while on the phone...
God bless you both for your thoughtfulness!