New tank - clownfish not eating

[Hallie]

I just set up a 55 gallon tank with clownfish. The only things I have in the tank besides the live rock and sand. It’s been 4 days since they ate. Won’t eat for me but when we bought them at the store, they were going nuts for the owner. Feeding frenzy!! Bought the same food they were feeding them. Tried dropping it in front of their face, putting it on top. Everything. Starting to get a little worried. 
 

any advice is appreciated!! Thanks

[Clown79]

How old is the tank and was it finished cycling?

[Tamberav]

+1 check Ammonia