hello,
we already have an official "answer" for this (here (14 days ago): http://forum.square-enix.com/ffxiv/t...equests/page64)

Quote Originally Posted by Grekumah View Post
Greetings, everyone,

I was able to get some responses to a few requests, and I would like to relay that information to you all.

...

Fish tanks have been requested for some time now and rest assured that the dev. team is looking into it, but they have no updates to share at the moment.

As always, keep the feedback coming and I’ll keep talking with the devs!