My 4 inch GT keeps spitting out his food. For about two minutes he will keep going after one and then immediately spit it out. He seems to be fine, not acting strange at all except for the spitting. I noticed it a couple of days ago. His colors are beautiful and he's swimming around like he always does. Any ideas why this is happening. He's in a 55 Gallon with 3 small bala sharks and 1 small pleco.