It's not so much the number of fish as it is how big they are. Rule of thumb is one inch of fish per gallon of water from what I have been told. But I'm not a real fish expert. They will be along shortly I'm sure.
Assumptions do nothing but make an ass out of u and me.
We can stick our heads in the sand for only so long before it starts choking us. Face it folks. The pet population is bad ALL OVER THE WORLD!