Jhosephine wrote...
In my current ME1 playthrough it's all about Ash and Kaidan, I just love having them both in my squad. After Virmire, it's most likely Garrus who takes Ash's place again. Despite having Ash and Garrus as great friends, it's Kaidan my Shepard really talks to.
In ME2 that role is covered by the fish
Because despite Garrus being there, he has so little to say if you're not romancing him so might as well talk to the fish. They have almost as much dialogue and being my Shepard's fish basically means they are on their own suicide mission as well 
Yeah, I miss Kaidan.

Good morning, everyone! Jho, I love this picture!

I just want to reach through the screen and grab that hand. It's so inviting (and the gorgeous eyes don't hurt, either

).
As for the fish being the ones you talk to, I always enjoy taking a trip to see Kaidan's picture on the desk, so it's only fair to pay attention to the fish. I really hope that when Kaidan is back on the Normandy (and I choose to say when and not if... positive thoughts make it happen

) there is some form of mention about having fish in your cabin.