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The cataphylia jardenei,elegance coral gows in lagoons or fringe reef structures that are relatively high in nutrients("dirty water"). It needs low to moderate current and modetrater light at least eary on. In it's natural habitat is is usually partly shaded by sea grass.
They have been impossible to keep in recent years but used to be considered quite hardy. Tanks with lower nutrrient levels may be part of the problem as well as collection techniques and areas of collection.
Closing up and excretions could be due to too much light or current or the coral could be beggining a downward spiral.
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Tom
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