Brown Sump Waste

[mark]

With all the concerns of needing ro/di water, nitrate factories etc, I'm rather surprised the detritus is being left that long in your sumps.

Normally I do 80l water changes, I'll siphon out ~50l from the display to get the accumulations there, then I'll go downstairs and siphon out from the sump and refugium ~30l to get the crap the builds up below.