hi, I have had a common goldfish and a black moor for over 9 months now. They both look fine to me, except for the fact that after every meal my black moor start gasping at the Surface for a while. I just don't get it. I only feed them with pellets or peas..zucchini...and they are used to finding their food at the bottom of the tank. I just don't understand this weird behaviour out of the blue. I have also noticed that the common goldfish has recently started bullying the black moor during their meals by pushing him upwards in order to hog all the food even though he's clearly full . Any clue about what ' s going on?