First, a couple questions:

1. Are you supposed to get a reward for each star you get, as you add beauty points to an aquarium?
2. When you get 3 stars, is the reward supposed to be the same as 1 and 2 stars, or even bigger?

Background: I am at level 1000+ on the latest (Christmassy) Android version. Sometimes, I have gotten a star, and not been rewarded in the past. I thought maybe it was a random thing, and you don't always get a reward. But earlier today I got all 3 stars in an aquarium, and did not get rewarded, and thought this is off. It take a ton of beauty points to get stars at the higher levels, and there should be a reward. Especially when you get all 3 stars.

What gives?