white film question

DLANDINO

D.L. Heritage Rings
I have been watching a white film that is on the underside of one of my live rocks. It has been in the aquarium for about a month and a half with no spread and no adverse affects on my tests. Anyone know what it may be
 
p.s pics of this would be impossible but to better describe it it looks like translucent white loose gel.
 
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