<<
Evidently hydra, planaria, and the like were more of a problem in Innes'
day when filtration was fairly primitive. >>
I think hydra are often introduced with wild caught daphnia, mosquito larva,
etc. They are fed and encouraged by newly hatched brine shrimp - BUT NOT
CAUSED BY IT. Very low levels of formalin-copper medications will kill them
without harming any fish.
Lee Harper
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