Ooh thats looking neato. I love the railing - beware of the pirhanas!
I'd suggest some fishbowls as individual displays and also if you go to the sticky deco thread skylark posted and then go to the last page near the bottom you can see where someone posted the bagball terrarium I made a couple years ago, that could be easily adapted for an octagonal aquarium.
Also as far as NPC bought aquariums being expensive you might want to make a post on your shard trading forum here that you are looking to buy fishtanks from players who are no longer using then at half price, and will even accept donations for your new aquarium. You might get some cheap or free that way, and that will help you save up your pennies to get a lovely seahorse.
BTW a few years ago I turned a whole house into a giant aquarium (with mixed results). I got compliments on my "crazy alien creatures", lol:
I really liked the bagball fish and the merman/mermaid (on top of the little tank castle):
Inside the castle:
I had vendors on top, next to the tank entrance (you could drop down inside to "swim", hehe):
A little personal anecdote that you might find interesting. I really enjoyed making this aquarium house but bemoaned the fact that there were no 'clearish' walls that I could use, like semi-transparent panes of glass to indicate that it was a giant tank. So years later when I got asked my opinion by a dev friend of mine for what kind of new house tiles they should put in I suggested dark tiles (thinking of umbra and how cool those would be to have) and crystal - for the elves. Since we go the tree hugging variety of elves I was partially thinking of twisted spires and delicate shimmering towers but also of those semi transparent crystal walls that would look so great as windows. We ended up with something a little different than I was envisioning, lol, which will teach me to be more explicit in the future.
