Let $f(x)=x^{2}-6 x+5$ And $g(x)=\sqrt{x+5}$ Find $\left(g^{\circ} g\right)(20)$

Let $f(x)=x^{2}-6 x+5$ and $g(x)=\sqrt{x+5}$ . Find $\left(g^{\circ} g\right)(20)$ .