Then on top of care some fish are long lived....longer than snakes. Plenty of parents find this out the hard way when they get 10 year old lil Johnny a snake and the thing is still kicking when it is time to move off to college and it becomes theirs. Or like buying a parrot of tortoise some fish can be a life long investment.....like Koi.
Then like mentioned about the start up on a full real deal setup is not cheap. I looked into it and really wanted a salt water tank. After I did my homework I decided it was not what I needed at the time. My Koi pond gives me more than enough to do. One thing I really enjoy about my pond is it is large and on a hot day after some yard work I get in. Relax with a cigar and some whiskey. My wife on the other hand will not get in.Even though the water is clear and we know exactly what is in it. I grew up in the country though so swimming in creeks and ponds was a norm. Saw one of my first Coral Snakes swimming at a beaver dam.