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- 14 May 2018
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Hi All inherited a mature magnificent 4 foot tank with sump. Run my UV light in the sump. Skimmer in the sump. Running an external filtration as well. Have 9 fish, clowns, clown wrasse, picasso trigger, emperor angel, gobie. No live rock no coral. Running a Maxspect Gyro. Changing 20l of water every two weeks. Getting a bit greyish algae in the sump and on the dead rocks. Any advice welcome