Are 'saltwater' or 'marine' fish hard to take care of?

Are 'saltwater' or 'marine' fish hard to take care of?

Marc Grover (Professional Aquarist) gives expert video advice on: Are goldfish easy to take care of?; How many fish should I get to start an aquarium?; How do I choose a healthy fish? and more...

The difficulty again is the fact that they've grown up their entire lives in the ocean, be it a short period of time or a long period of time, and they have to adapt from going from the world's biggest ecosystem into an aquarium. It may be a huge aquarium to us, but its going to be smaller than their natural environment to them. Therefore the impetus of controlling that environment and making sure it's as perfect as possible, falls on the hobbyist and it's critical that this is taken care of. Freshwater fish, however are much more forgiving. You can make mistakes and get away with it. Saltwater fish, less so.