So this Sunday was choir day, Change out GFO, WC, Add Bicolor Blenny from QT to display, and test After finishing everything i was so happy about my tank being stable and sps are finally encrusting/coloring up i decided to get myself a Canon T4i. came home played with it and its awesome. Monday comes around, hmm.. some sps are receding strange, did not think about it as much Tuesday comes around, holy crap stn from weird spots. test, everything comes out good. raised the lights a bit. Wednesday comes. ok this is getting out of hand, Test again. See my Bicolor blenny nipping at some corals, removed and put in frag tank. Remove Frag and dip, No pest. REMOVED 1/2 OF GFO AND REDUCED FLOW the only thing i changed was GFO, WC, And intiated Zeovit products (AA,C.V, Extra Special) i rinsed the GFO with r/o before adding. added a little less amount from previous. ( i think i was 9teaspoons?) and i read here GFO can cause some SPS issues if used improperly. My question is, WAS it the GFO? or is it something else? frag.. Heres the frag, dipped My red planet showing some So i removed the bicolor blenny, cut the gfo in half and reduced the flow, raised the lights.. should i do a WC? Get a Polyfilter? I have a Green Slimer starting with some stn, Hollywood Stunner, and Season Greeting as far as i can tell they all are starting to get some..