I need help. I have 5 Knight Goby's. My biggest one has decided he wants to be a picky eater. I have have given them Frozen bloodworms and Marine Mix, algea wafers and flakes. All the others are eating fine. He seems to be doing good but keeps spitting out the food. He ate really good for about a week and now being picky. What else can i try to feed him. They are in a brackish 75 gallon tank and water is fine. I am trying to get figure 8 puffers but none available at the moment.