I have a 39 gallon tank with a bicolor angel a clown and the hawkfish we have had them all for a month,now the hawkfish stopped eating for three days now only lies on the bottom of the tank and breathing more rapidly then usual all the ammon ph alk nitrates and nitrites are all in the ranges they are suppose to be he has no signs of spots or anything that i can see his eyes are clear i just dont know what to do if he is suffering i dont like that