Each polyp is connected by a flexible mat which is red to dark purple if Pachyclavularia sp. and lighter purple if Briareum sp. The mat may adhere strongly to rock or even a smooth surface like glass or plastic, but can also grow across the sand. Its growth rate may be very fast, and if placed too close to another coral it may grow right over it. Plenty of space should be provided to accommodate this future growth. If disturbed this coral may completely retract its polyps into the mat. Briareum sp. may occasionally shed a waxy sheet, which is a natural cleansing behavior.

These corals receive most of their energy by utilizing the photosynthetic algae contained within their tissues. They will also benefit from occasional feedings of fine zooplankton. Being highly adaptable and nearly pest and disease free makes them a great choice for beginners. Most coral eating fish will not touch them; any damage that may occur to the colony is typically re-grown with vigor. They may be sensitive to the aluminum oxide in some phosphate-absorbing media, and to the over use of iodine. Occasionally blowing the colony with a baster or powerhead will help clear detritus from between the polyps and discourage nuisance algae.

Star Polyp resembles its close relative Pipe Organ coral; the main difference is speed of growth. While Star Polyp grows very quickly, Pipe Organ grows much slower as it must construct a rigid tube for each polyp.

• Difficulty: Easy
• Growth Speed: Fast
• Lighting: Low - High
• Average Placement: Low - Top
• Water Flow: Low - Strong
• Temperament: Peaceful

Green Star Polyp is an all-time favorite which nearly every aquarist keeps at one time or another. It is affectionately known as “GSP” and is known for its intense emerald color, which fluoresces vividly under actinic lighting. The base of each tentacle is often deep pink, with a spot of stark white in the center of each polyp.

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