Hi, I just started my journey into the saltwater hobby I cycled my 32 gallon tank and added my first fish a Banggai Cardinalfish to my tank. I bought frozen mysis for it and it wont eat it. It swims up to the shrimp takes one bite of it then spits it back out then doesn't go after the rest of the food it just goes back to its normal spot in the tank. I have had the fish now for 5 days Im scared its going to starve if it doesn't it. I have tested my tank and all the values are at almost 0. Nitrates being the only one with a value at 5ppm I did a water change just to make sure all is well my salinity is as 1,024 . Please help !