A saltwater aquarium can be a dramatic addition to any room. Filled with exotic (and expensive) fish, it’s visually appealing and a great conversation piece. But it isn’t exactly easy to care for.

Cultivating a saltwater fish tank is a bit like making a souffle — impressive if you pull it off, but delicate and easy to screw up. Still, it's easy to see why this hobby remains popular. At its best ...

There’s a stereotype that keeping saltwater fish tanks is very difficult. Maybe this was true once. Now it’s much easier ...