From the picture the aquarium already looks awesome. When I was staff on UN I remmeber the aquarium they already had on the server, and by looking at that picture it looks nothing alike :P. The old one was like you said just a pile of sand. It's good that some major updates are happening to UN and SeaPort is actually turning out good unlike before. Let's see how the fishing turns out, but I would like to see something fun and not just pressing 'a'.
The fish donating thing sounds like Animal Crossing if you ever played that

. However, I most likely will try to get atleast one little fishy, and name it after myself

.
It does look like a job well done though, so great job.