Colombia Wall & Shallows Colombia is a deep reef featuring massive coral pillars, caves and tunnels.  You’ll see a colorful array of corals and sponges, home to colorful fish.  The Blue Tang is called a surgeonfish because the yellow diamond on its tail is a spine that is as sharp as a surgeon’s scalpel. It is used to aid in defence.  Text and phots by Bonnie Pelnar of Under Watercolours. COPYRIGHT 1999-2002 UNDER WATERCOLOURS