I believe they may have a shortened life span living in warmer waters like that only because their metabolism will be faster. Other than that, they'll be perfectly healthy and fine.
As everyone else has stated, they will do just fine just be prepared for the bio load they create. I have been rasing koi for years indoors and they are messy.
I believe they may have a shortened life span living in warmer waters like that only because their metabolism will be faster. Other than that, they'll be perfectly healthy and fine.
My general experience seems to back that up but the difference is only a few years. On average colour and pattern stay better over time however when the koi can also enjoy regular cooler periods