First time filling coolant in my life. So nervous!

I have just finish the first system and start filling coolant. It was so nervous and excited in the same time.

There something for improvement and big work for the second system.

P/S: I removed the top fans for easier to test.

https://preview.redd.it/oib01x2kdf5e1.png?width=4032&format=png&auto=webp&s=99710e08cf75554e2148262839cc20e7ba354171