having a tank full of northern fish outside in the heat is his first mistake. the temp is going to go up from what the temp of the water he is collecting them from is and would probably cause most of the fish to die. he would need a chiller to keep the tank water from rising, and there are probably more problems that will arise in keeping a tank outside. what is he going to do with it when the seasons change? and like redpaulus said, he can get in a lot of trouble for having undersized game fish, and game fish at all if it is illegal. your friend is making a lot of mistakes if he is trying to keep these fish alive and keep himself out of trouble.
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Current setups: 1800 gallon koi pond, 10 gallon planted, 150 gallon reef, other FOWLR tanks
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