Reefs are made by corals, right? Well, not always – there are many ways to build a reef. Sometimes the construction work is carried out by tube-dwelling worms in the cold waters off Europe, or, in the case of these pics, the reefs are created by a complex mix of calcium-depositing algae, [...]
Kauai, Hawaii coastline taken during a helicopter tourI have been lucky in my life to have had the opportunity to dive in some of the prettiest and most diverse underwater habitats on earth. Without exception, the nicest dive sites are far from civilization, which stands to reason. But today I want [...]
QuestionWhat exactly is the difference between a “sump” and a “refugium” (assuming there is a difference)? These are terms I didn’t hear in my 30-plus years as a freshwater aquarist, but I’ve heard them numerous times since starting my first saltwater tank.” – Submitted by Moira B [...]
