Circular White spot in Heavy planted tank?

[sae at arts_ubc.ca (Olga Betts)]

Tom Petersen wrote:
>Subject: 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.

Do you have any kids or animals that could have dropped/knocked something
into the tank? Is it separate and lying on the substrate or attached/in the
substrate? Have you tried touching/moving it?

Olga
in Vancouver

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