Coolant Leak

[Buzzcut]

I replaced my expansion tank about a month ago, because it was leaking from the topmost hose connection.

Now I noticed a spot on the ground underneath the car, right under the radiator. It's a branch of the main radiator to thermostat hose, leaking from a connection to the radiator on the right side, near the bottom.

I guess my problem is, with the expansion tank, I first replaced the topmost hose, which did not fix the problem. If this leak is not solved by replacing the hose, what gets replaced next? The radiator!?!

Hopefully you can see the wet hose in this pic, near the radiator.

I guess another question is, with the expansion tank, there was no obvious reason for the leak (no crack or anything like that). Is there any other way to fix this without replacing the hose?