Codominance is where both traits show, and in this case, with the red and blue, they show. Incomplete dominance is characterized by blending; in that case, the fish would have to be purple because red and blue make purple. It's not multiple alleles because there isn't anything to suggest that there are more than 2 alleles for the color gene.
<h3>adipose tissue cells</h3><h3>adipose tissue cellsUnder a microscope, adipose tissue cells appear empty due to the extraction of fat during the processing of the material </h3>