WTB:Looking to buy a long, low fish tank for turtle

Looking for something for mr turtle.He’s in a 20gal. long right now and was going to get a 30 long but would like to get something bigger for him.I have an extra 55gal laying around but thinks it’s a little too high.I knew a kid in lockport that had 2 gators and they were in a 125 Long.It was like 18"X 8ft.Does anyone know if they make something like this?
D

side-topic; is the 55G fish worthy and what do you want for it if it is? PM me.