I love the way that poly is peeking out of the sand. Reminds me of when I used to keep dojo loaches and they'd burrow into the sand and I'd see their heads poking out of the sand.
When you have the opportunity and space to get one of your dream fish for free, you don't turn it down. Every bit of 16". Unfortunately most likely stunted as it spent at least 4 years in a cramped 90 with way too many other monster fish. But I didn't test the water, so I can't say for sure. Overall he looks healthy though.