I'm gonna give you the reply that I got alot. Did you acclimate them long? My last few experiences with peppermints, I just floated the bag in tank and added a little water every few minutes for maybe 30-45 minutes. They always ended up not making it over night. I bought 3 more last Tues. I acclimated them for 2 hours. Didnt drip them just added a little water every 5 minutes or so. Well, it's been a week and they are still alive. Seen them all 3 out last night. 2 are always together and the other one is not too far away. I think im even noticing not as many aips in the tank now too.
Steve