Leaking toilet - Event Date: 24 Jun 2020

Hey guys, first trip and we realize that water from our freshwater tank wasn’t pumping any water and all of a sudden we had a leak in our toilet. We got home and tried to make all the water work. Works fine with the city water, but as I was trying to figure out the problem all the sudden the toilet is leaking from underneath the floor. I was hoping somebody could identify this part so I can order it and replace it please. Thank you in advance! Once I fix the toilet, I will try to figure out why the water isn’t pumping[Picture

In the middle below the hinge where the pipe comes up there is a black object connected to the tube. It seems to be leaking from there. How it got to the floor I am not sure, I am still trying to spot that. But the big spraying link is below the hinge behind the toilet.

Thank you, I just saw that my image had limited access. I was sketchy because I thought it was difficult to explain, sorry! I the middle below the hinge where the pipe comes up there is a black object connected to the tube. It seems to be leaking from there. How it got to the floor I am not sure, I am still trying to spot that. But the big spraying link is below the hinge behind the toilet.

Thank you.