I bought 2 CL's from Petsmart ($3 each!) yesterday to add to my shoal. They are really light in color (all of them at petsmart were) compared to my current CL's. My current CL's are a vibrant orange and their stripes are really black. The new ones are dull in color. Is there a reason they are so light? Is there anything I can do to help them gain more color? Also, before someone mentions this...they are not "grayed out"