green mushroom question.

[JasonJ]

interesting.
i've had my tank runnin for about 2 months...i have the 24" 130watts coralife pc on my 20 gal. havent changed my lights. but the mushroom has been in there for 3 weeks. first day i got it. it turned brown. and today all of a sudden it changed back to its green color.

[danny zubot]

It will appear to be more green when its smaller and brown when swollen because of the zoanthalae algea. There is only a certain amount inside of it so when the ouer tissue expands, the concentration of zoanthalae seemingly decreases. All LPS, softies etc do this until they bring the volume of zoanthalae up.