I think you are going to need more powerful powerheads for your stream.
As I said, trout required BOTH oxygen and cool temperatures to live. Not just high oxygen levels to keep the trout alive. As I said it before, brown trout can handle slighly warm temperatures, unlike brookies and rainbows. Seems that you never been to the trout hatcheries before to see how it works. All trout hatcheries are required to have cool temperatures and high oxygen levels to keep their trout stock alive. Even in the crowded ponds, the water is still cold!
You got it right. For last time I have said this..... trout required cooler temperatures and high oxygen levels to live. Simple as that.I'm not saying that cooler water is a bad thing. It is however incorrect to say that they will "struggle" to survice in 68 degree water, they won't. As has been said many times in this thread, oxygen is also key. If the OP decides to keep them, and has 68 degree water with sufficient oxygen, they will not "Struggle" to survive. If however the temp is higher, and/or is not oxgenated enough, then they may die. They have range beyond 68 degrees, but that would be short term (height of summer). Now the temp at height of summer would depend on where you live, I've no idea on temps in NJ, so that would have to be the call of the OP or someone who does know NJ.
68 degrees is NOT outside a rainbow trouts range, but I can see we are never going to agree.
You got it right. For last time I have said this..... trout required cooler temperatures and high oxygen levels to live. Simple as that.
Gotta stick my2 cents in...A few years ago I had a bunch of tanks set up and was breeding guppies to sell. SOme guppies were born deformed and instead of killing them I devoted my biggest tank to brook trout so I would have something to do with the deformed guys instead of just killing them. I dont know what the temp was but I know it was probably mid 70's. They were doing great. Soon as I dropped a guppy in bam, gone. Trout were allways swimming around and nice and active and even got to know me and cam up to the glass when I came into the room looking for food. I kept them for quite a while before putting them back in the brook. Ive thought about keeping them again for sure now that I got a bigger tank. They were awesome to keep. Trout have allways been my favorite fish.