Got this colony of zoo polyps about a week ago. When i put them in the tank they fully opened up in about 10 minutes or so. that night i found one of those predatory snails on it and i pulled it of with twezzers. looked over the colony very slowly and didn't find anything else. since then they are barely opening up. i've moved them aroung to see if they like an area better than another and no progress, whats going on?? everything else in tank is doing fine. i do have a micro bubble issue, don't know if this is the problem.. any ideas would be greatly appreciated.