i was doing a water change in my parents pond the other day, and i saw this black mystery apple snail. i've had them before and i know they can't survive the cold, so i pulled him out and he was still alive. i pushed on the hard little plate they cover the shell opening with and it was firm and solid, and he didn't smell fishy, so i put him in a (clean) bucket with pond water and brought him inside so the water could slowly warm up. he's doing better now. i attached some lettuce with a rubber band to a large, heavy shell. i'm going to put him in my tank once its cycled, but until then i have to keep him in a large vase i used to have my betta in. will he be alright in there if i do like 50% water changes every other day and keep the water good and clean?