Mid Summer Maintenance

Hello all,

can anybody give us their ritual of mid summer maintenance to the pond.
I have a bio filter but I'm not sure if I should clean it since it is
established with good "bio".

Also does anybody have a good method of cleaning the inside of water
pump tubes that get coated with "guck" during these hot days.

Fish are happy and water is clear but there is more "sludge" at the
bottom and sides of the pond than there was in early summer.
Hottest summer on record here in southern Ontario !

Thanks !!