Groooovy fellow babies. I had no idea! Great photos. Mine is touching the front glass, so not really a place I'm crazy about the thing taking hold. Interesting to see that others have had similar experiences though. The famous PaulB on RC has a few posts about a glass bottle in his tank that has become encrusted. He scored or sanded the glass to rough it up & make it easier for critters to take hold & encrust. Not something you want to do to one of your tank sides though. I also have a mini glass bottle on the bottom, it's encrusted with coralline, but I didn't score the glass like PaulB did. Took years though.
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