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Mushroom Rock Problem

Subject: Mushroom Rock Problem
by Harps on 20/12/2009 18:57:24

Hi guys,

I have a piece of large 'Green Mushroom Rock' which I believe looks very much like a Ricordea. It has been in my tank for over a year and thrived. However, I have noticed that over the last couple of days, one of the mushrooms has developed a number of brown patches on its skin.

Does anyone have any idea what could have caused this and what I should do?

Water Parameters:

Ammonia 0
Nitrite 0
Nitrate 10
PH 8.2
Salinity .24
Calcium 390
Magnesium 1150
Phosphate 0

Thanks,

Harps