Hey man
I've heard of people keeping Gold Wolf Fish in a 60gal for quite a while. They are THE most active Wolf Fish species (to most people) and will always be roaming its tank, protecting it's territory. They also beg for food which is cool since you can train them to take from your forceps (I wouldn't recommend your fingers lol). The 2nd most active is a Rainbow Wolf which would live very well in a 55gal.
If you change your mind about only keeping one fish, a planted small predator tank is my recommendation
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fishcatch22;607733; said:
I doubt i'd want a bigger tank.
quoted since we all know one day you WILL eat these words and go bigger.
I JUST got into fish keeping this past september with a 55gal and I already want a 125gal sooo bad. Just reading everyday about more and more fish makes you want to go bigger!
best of luck
Brian