Water Chemistry

I let the tank run for about 5 days and didn't see anything being picking up on the tests, at the LFS.
So I decided to pick up some fish..
A Little Cherub Angelfish, approx. 1.5" and a Yellow Watchman Goby, approx. 1" and a Candy Cane Pistol Shrimp.

The first night the Cherub found a hiding spot and went to sleep. Nothing to worry about there.

But the Yellow Watchman constantly tried to jump. Thankfully the tank came with a glass cover and he was ...