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Water butt oddity...

CREZIERES, France(Zone 8a)

Just noticed this strange effect in my plastic water butt. It is filled by the drainpipe. It looks like something is eating the algae from the inside of the butt, but I can't figure out what. Any ideas???
The first image has been digitally enhanced to show the effect more clearly. The second is 'natural'. the miscellaneous shapes are reflections from the surface of, for example, the waterspout.

Thumbnail by cinemike Thumbnail by cinemike
Richmond, TX

I have seen this happen too, but I don't know what is at work.

Biggs, KY(Zone 6a)

I have seen that happen also but have no idea what causes it.

Ft Myers, FL(Zone 10a)

Definitely a freshwater oorganism at work there. :)

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