Good observation on the algae. Memphis Zoo has live plants with theirs. Mine were algae free but still thrived. the major link here seems to be the presence of plant material, living or (more likely) something being released by the decomposing plant materialthat benifits them.

An interesting example: a friend of mine (in S. Florida) was too meticulous in filtering his tank and his Tentacles developed blister disease. When he poured (dirty) water straight from a local canal into the tank the symptoms disappeared in a few days.

Frank
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"The luxury of not getting involved departed with the last lifeboat Skipper..."

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