"Cereus-validus" wrote in message
om...
Red tide in your bird bath?

May be a toxic bacteria growing there.

Thoroughly clean it out with bleach and start again.


Can you get red tide in fresh water? I've tried cleaning it but it just
keeps returning, regardless whether it's rainwater or tap water. I was
thinking more along the lines of a chemical reaction with something in the
concrete.... any possibility of that?

Karen