The colour is pink because it got bleached (expelled symbiotic algae) due to a temperature extreme either direction, or lighting changes (usually too much light).
The bubbles only form when clownfish live in them, as it is their way of reaching around the clowns for more light.
The black melanistic form of the clownfish only happens when they live in certain anemones. I believe it is a long tentacle anemone in the case of the saddle anemone. They are brown in other anemones. Once they change into black, they usually don't go back.
Target feed the anemone, and make sure it is getting enough light and it will bounce back.
The bubble tip (quadricolour) is the only anemone maroon (premna) clownfish go in in the wild.
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