If it is turning white, chances are that it has died. I'm no expert on sponges but I have had 2 blue ones. The first one turned completely white in less than a month (I threw it out) and the 2nd one is shrinking (but not turning white) and is still alive (after several months). I found out that they can kill acro millepora as the part of my millepora that was touching the blue sponge has died.
Hopefully, you didn't expose it to air as I heard that this would kill the sponge as well.
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