River model

In our river model we have 4 tubs with different environments in them. on day 1 we started by adding six orange and 20 brown minnows to tub #1 (the one on the bottom right corner). we also added a blue crayfish to tub #3 (the one in the top left corner). But it then quickly moved to tub #4 (bottom left corner). 3 minnows have already died, due to being sucked into the filter. 1 of them were fed to the crayfish. Later that day, 1 ghost shrimp was added to tub #3. And 3 brown minnows have moved to tub #2, and two minnows have found their way all the way to tub #4. There should be 23 minnows, 1 blue crayfish, and 1 ghost shrimp left.