I have a tank full of monsters that are going to be way to big for it very soon, originally i was going to build an indoor pond/tank, but instead have already started a pond outside. The pond will have water in it in about 2 weeks. water temps in my pool are 60 right now i think the pond will be a bit warmer since it will have a black liner. what would be the lowest temperature that i could put them in the outdoor pond be? I have oscars a pacu and a RTCxTSN they are in a 180 right now and the biggest is the pacu at 12". I need to give them more space and I know they will be fine in the summer, but I want to know when is the soonest i can put them outside.