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Circular White spot in Heavy planted tank?

Dear List,
I have recently discovered a 'silver-dollar'-sized(2 inch dia), white
circular spot on the rear of a heavilly planted tank.  It is located
behind a dense growth of jungle val(CO2, neutral pH, daily Natural
Gold,med-low lighting).  This white mass has recently developed pin-point
specs in the center, about the size of salt grains.  After recently
reading about the planaria posts, could this be something along these
lines, or could they be from cardinals, green-fire tetras, or cherry

Tom Petersen
peter334 at tc_umn.edu