New Reefer- BioCube 16

[Jmach08]

Hello everybody, I’m looking for help/advice in setting up a brand new nano reef tank. 

 

So I allowed my daughter to bring some hermit crabs home from Florida and turns out they were marine thin stripe crabs. After much groaning, I find a Fluval 13.5 online and it arrives broken. I’ve already had these crabs is a makeshift container for over a week so I bought a Coralife BioCube 16 from a local fish store at a great price. I set up the cube last night with Arag-Alive Bahama sand and Imagitarium Pacific Ocean water and set the crabs inside. This morning the water has cleared up and I have some CaribSea life rock coming today. The heater is working well and has the water at 80 degrees. I tested the water and got the following with my API master saltwater kit. 
PH: 7.9

Amonia: .25-.50

Nitrite: 0

Nitrate: 0

 

Is this normal? Do I need to add any of these additives I see? Thanks in advance. Any feedback is greatly appreciated.