Perhaps its temperature related.
--
Kind Regards
Cameron


"R. Santink" wrote in message
...


I notice it with crypts especially x willissii "lucens"; it means
they're
out of nutrients, probably nitrate - adding nitrate and phosphate
cures it here.

If so, why do they go through this cycle every day? They certainly are
growing quite well. Over the next few days, I'm documenting their
behaviour and will post it here.

RAS


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