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I always thought the rule was once a coral is bleached it can never return to its normal color (especially for anemones?)
That is hard to say. Mushrooms like medium to lower light levels. If your water perameters are good, then it should start to color up within a couple of weeks. If it starts shrinking in size, than give it a little more light.how long is a while wendy like weeks or months?
If it starts shrinking in size, than give it a little more light.
A coral that is getting just the perfect amount of light will be a normal size. Mushrooms will only get to a certain size and stop growing larger. They will reproduce but they won't get any larger. A mushroom that is starving from lack of light will move, stretch or expand to try to absorb more light. It may look bigger or more swollen but that doesn't mean it's happy. Even if it looks better to you the coral is starving. A mushroom that is getting too much light will shrink down, move or hide from the light. Many soft corals do this including zoanthids, palys, leathers.
Mushrooms expand when they are happy. But if the stalks of the mushroom are elongating towards the surface THEN that means its not getting enough light. Trust me, expand equals good.

