I was thinking that they should have recovered more by now also. But I just keep tossing it up now to the 30v they were at for almost 4-5 hours. I figure it just extremely stressed them all to the point where they all almost died? I'm figuring at least a week for them to recover and hoping for sooner.My tank is 5.7 without the ground probe and 0 with probe. Your tank is low very low compared to mine. I think your corals should have recovered quite soon after removing the bad equipment. Honestly I ran my tank with this voltage for a year or so before I was tired of getting shocked. After adding the probe I can't say I noticed a difference in any of the corals.