It's more work then freshwater for sure. The biggest thing is you have to have patience and take things slow at first. And you can't slack on tank maintenance. I think the people that have the most problems are ones that don't do regular water changes, make sure skimmer is running well, tank topped off, etc. Once you add corals then you'll start dosing calcium and other supplements. All those test kits, additives, salt, etc. add up to a lot more money to keep the tank running then a freshwater needs.