I think puttputt wasn't trying to be negative about it, I think he was pissed off at the state of the tank.
As Smidey would normally talk to someone at the restaurant to try and solve the problem, puttputt has tried to take things to the people higher up, the ones actually in charge. (This should prevent it happening again).
He isn't trying to name and shame, he's trying to track down who is actually looking after the tank, as THEY are the ones that need to be sat down and talked to.
I agree that fish are more than ornaments. And I find it heart breaking that big fish are put in little tanks.
Smidey, In my opinion, talking to the people at the restaurant would only be a short term fix. You let them know that something needs to be done, the waitress may (or may not) pass on the message, but they would pass it on to a manager, who may (or may not) pass it on again. Puttputt is trying to go straight to the person maintaining the tank.
Public awareness isn't a bad thing. It's not stopping people going there for the food (yet.)