Yes, but they take a LOT of work and patience (and money). My son started out with a fresh water aquarium, but I guess it wasn't challenging enough, and the fish aren't as beautiful as salt water fish. He graduated up to a reef tank and didn't have any idea how complicated it is maintaining the chemical balance of the water. But it's his baby. He loves finding new corals and fish to add. It is an impressive tank. Actually he has two 80 gallon tanks (I think) plus one "hospital" tank for fish that need to be quarantined. It's one of those hobbies that keeps growing and growing. LOL
I enjoy watching the activity in his tank. It's like a whole world unto itself. And, unless you look very closely, you miss the little emerald crabs and shrimp crawling around the rocks.
The clown fish and the anemone seem to be co-dependant. The clown fish actually will bring food to the anemone. The ecology of the tank is fascinating.