cloudy water

[durrantkevin]

i have a biocube 29 and i have a red maderin and a snow flake eel, as well as a tube anenamy with some sps. everything was going good checking the water than out of the blue it got cloudy and everything closed up, i did a water change and checked the water again everything is still good but my sps is sluggish to open and the waters stil alittle cloudy?????? help me please im still new to marine and not sure what to do.