Pet wrote:

Hello Pet

P Anyway, in order to slow down the flow into the first stage
P rather than water pumping straight out the overflow, I put
P half a dozen filter brushes into the chamber. This worked
P fine, but now there are tiny wiggly worms about 2" long and
P perhaps the thickness of a couple of hairs. (red in colour)
P Are they a sign of something going wrong, will they endanger
P the fish, should I remove the brushes as they seem to thrive
P in the bristles.

Sound like midge larvae. Won't harm your fish, but if they get washed
into the pond they might make 'em fatter.

--
Simon Avery, Dartmoor, UK Ý http://www.digdilem.org/