When adding the sand ... I use a piece of 2 or 3 inch pvc just long enough to go from the bottom of the tank to just above the rim, by filling the tube while its in the tank you really reduce the cloudiness. However DO NOT LIFT THE TUBE OUT OF THE WATER UNTIL YOU ARE COMPLETELY DONE. When you are done adding sand, get all the sand out of the tube, then cover the bottom of the tube with your hand so as to keep all the water / dust in the tube, then lift it out of the tank. If you do it this way your water should stay mostly clear.
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Starting fresh ... 90 gal, 40gal sump, sundial T5HO x 4, 2 x koralia 2's, ASM G1X skimmer 
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