Phyllis and Jim Hurley wrote:
Our cement pond runs a steady coat of dark black/bule algae that nicely
hides all colors. People have named it from time to time. Can anyone
help us out?

Thanks

Jim

Does black brush algae (a freshwater red algae) ever grow in ponds? It
looks like this. http://www.aquatic-gardeners.org/redalgae.html It's
usually pretty true black and the fuzz gets about 2 cm long. In
fishtanks it's a clean water algae and harmless to fish but can cover
slow-growing plants to the point of smothering them

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Elaine T __
http://eethomp.com/fish.html '__
rec.aquaria.* FAQ http://faq.thekrib.com