Could be a little brown algae ?

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Dr5000

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If you can't be kind,
at least have the decency to be vague.
_______________________
"Bill Stock" wrote in message
ers.com...
"Bill Stock" wrote in message
gers.com...
The tips of my Hornwort are turning brown. Any ideas?

PH 7.5
Temp 25C
Nitrates 20 ppm
Light 72W CFL (Double in winter)