I have a 46 gallon tank with 4 small albino bristle nose plecos, they are going to be fore breeding and they are all at the age that I can sex them and I have a perfect 1 male to 3 females (so I really don't want to lose a fish) all of them are eating perfectly except for one female, the other three have nice fat tummys but this one is starting to loose her yellow color and become a off white color while becoming extremely skinny to the point I bone structure of her head. I feed them green beans, zucchini,cucumber, and everyone and then sinking wafers but she won't take any of it, it can't be water conditions because the other three are doing extremely well. She might be sick but she swims and acts completely normal. Just she won't even touch any food I put in the tank. Has anyone ever had a pleco act like this before?? What did you guys do or what do you think I should do to help it? Keep in mind there's only four fish in this tank since I'm growing them up for breeding. I supply my LFS with shell dwellers and BN plecos. Thank you!!!