I don't know where you live but we've got a comet pond in our backyard that he could go into. I can't promise he wouldn't become Great Blue Heron food lol but it's a nice big pond, we started with 3 of them and now have well over 200 in there ><
And yeah, sorry I spoofed on the tank size. I really should watch what I'm typing, sorry!!
But yes I think your uni pond would be a good step to take, that way he'd be getting good care (I say good because even my uni, at one building which is the building: center of biology and life sciences don't even take care of half their fish in there. I'm actually going Monday to take care of someone's Betta fish >.>) but anyway, it'd be a nice open place for him to be in and be cared for!