I had the same problem with mine but I thing I know what happened. I came home and my fan to cool the MH had fallen down the temp was 84 degrees :shock: . It was a pretty GBTA now it is a WBTA. It eats great so will the color ever come back or am I stuck with it the way it is? It's very small maybe the size of a half dollar so I'm hoping over time the color will come back. Anybody else know? Sorry Stonedog didn't mean to highjack your thread but it seems we have the same problem. Ashlar is their anyway to replenish the zooxanthellae it's lost?