Yellow clown goby not eating?

[Cooperdude916]

My yellow clown goby in a 20 gallon long with a Pygmy cherub angel, six line wrasse, and a percula clownfish hs stopped eating. I am wandering why this is. Ere hasn't been any signs of aggression between any of them but the angel and clownfish between each other. I am just wandering why the goby isn't eating. I just reciently did a water change and all the specs are perfect. Except the nitrates because I use tap water but that doesnt affect anything in my dads reef.

 

[Painted skin]

More info needed what are you feeding and how long have you had the fishes..? By the way you don't get nitrate from or because you use tap...

 

[Cooperdude916]

I feed them an herbivore mix and dehydrated brine shrimp. My tap water has around 20 nitrate right when it comes out of the faucet. I'm going to get an ro/di system in a little while. I've had the goby for about 2 and a half months and the other 3 for around 3 months.