Minimum temp for keeping them, or minimum survivable temp? I had a bunch in a cooler during a move, probably 10-11hrs. Water temp went to the high 50's/ low 60's and the fish looked dead, just floating/drifting around. I warmed the water slowly, and didn't lose any. Don't recommend it though. I keep mine (africans) at 74 when I'm on vacation. They need less food and are not as aggressive. 78 the rest of the time