Hello everyone it been quite along time since I visited. I've got a quick Question I'd like to ask. I recently bought a couple algae eaters to try and combat a an algae problem. Both are doing quite well and are very active , but I noticed one has changed color. Is this normal? I don't see anything wrong with him/her but it just seemed to happen within about a weeks time of putting them in the tank. The one stayed the same color as when purchased (a grayish color) But the other has went to a Yellow color. Any idea's?