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Thanks Erin I used a suction to remove water and clean the sand, removed about 50 Litres. I cleaned my skimmer (not very dirty though) and clean my canister filter which runs taking water from the sump inlet side. I scraped and cleaned the glass and then replaced the water with RO water doses...

I wonder if anyone can offer advice please. I have a large 600L tank with 150L sump which has been running OK for a couple of years. Yesterday I did a water change and clean up of the system in readiness for adding some stock over Christmas. Today the entire tank and sump has gone very cloudy...