I was waiting for a post like this to come up. I realize what he has the potential to turn into, I realize what every fish I have ever owned has the potential to turn into. Even with my 500 gallon I had at the time with all those peacock bass, rays, etc. that my tank was too small when they grew larger, I didn't get a single "you will need a bigger tank" post when I had that setup.
I've always wanted a Musky, around 30" but in KY its illegal to keep a Musky this small, which is why I got it from a fish hatchery, sometimes they are available at the LFS but haven't seen one is a while. I was wanting a Tiger Musky but haven't seen one of them in a while either.
The musky I have now is a around 8 months to a year old, he will grow double that in the right conditions in the wild but most likely not in an aquarium, as with almost any other fish we keep on here that get larger than the tank we house them in. Should the Musky make a meal out of any other fish in my tank, that's fine with me. I can catch them anytime and they are free.
I know a lot of folks say this but should I have to get rid of the Musky, I know 2 folks that would take him for their lake. One of them bought one from the store, put it in his lake and didn't see it again till 3 years later when another guy was bass fishing and caught it at 38", he released it back into the lake.
Should I have a house next year like I plan, I would love to build a plywood tank and keep him. I've always wanted to do what I did in my 500 with natives but on a larger scale.