Put in few cheap fish today, just to get system going before getting some Tilapia fingerlings next week.
These fish normally use for bait or feed for larger aquarium fishes, but will do as a starter.
No idea what variety are they, looks like some gold fish.
Put the whole bag in the tank to stabilize water temperature for a few minutes.
Amir help in pouring it all in.
I think about less than twenty in there, these fishes also help mosquito larvae in-check.