In flow, a spring, anything with cool O2 water is huge. The trout actually seek that out and stay there. My problem is none of the above, plus literally zero shade. One little foot bridge and that is where they all hang out until floating. Also the naturals or regulars are much more heat tolerant vs. the triploids, which is what we want. So I'm thinking better off just getting them to live than watching triploids float since they are not as hardy. I just got a load of dregs, bullfrog polliwogs/res/gsf and bg. Probably 120 lbs. Have to get busy sorting.