teach me about polyp extension

[Bblinks]

Parameter looks good, I would check flow, make sure there isn;t any direct flow on the frags. Also take a look at night and see if there is any PE on then, maybe some thing is irritating it during the day time hours. Worst case scenario I would check for pest like aefw since they go after Bonsai and any smooth skin sps first. I would remove the sps and dip it in a clear cup with revive then observe what comes off. If that doesn't yield any results then you can start trying to feed the corals some oyster feast or just general coral food and supplement with zeovit k balance. I would highly recommand you test the level for k before dosing for that matter any other additive you might want to add.