like ▁tent acles . ▁The ▁colour ▁is ▁usually ▁white , ▁pale ▁grey , ▁pale ▁brown ▁or ▁bl u ish - white , ▁and ▁viewed ▁from ▁above , ▁the ▁poly ps ▁somewhat ▁res emble ▁snow f la kes . ▁ ▁Distribution ▁and ▁habitat ▁A . ▁gla uca ▁is ▁found ▁on ▁re ef s ▁in ▁the ▁Ind o - P ac ific ▁region ▁from ▁the ▁Red ▁Sea ▁to ▁Hawai i , ▁growing ▁at ▁depth s ▁between ▁. ▁Its ▁range ▁includes ▁the ▁eastern ▁coast ▁of ▁Africa ▁and ▁at ▁S od w ana ▁Bay , ▁this ▁cor al ▁grows ▁on ▁re ef s ▁formed ▁from ▁foss il ised ▁sand - d unes , ▁along ▁with ▁a ▁few ▁st ony ▁cor als ▁and ▁a ▁diverse ▁population ▁of ▁other ▁soft ▁cor als . ▁It ▁is ▁probably ▁the ▁most ▁common ▁species ▁in ▁its ▁genus . ▁ ▁Bi ology ▁Anth elia ▁gla uca ▁is ▁a ▁zo ox anth ell ate ▁soft ▁cor al ; ▁embedded ▁within ▁its ▁t issues ▁are ▁single - cel led ▁sym bi otic ▁din of lag ell ates ▁which ▁provide ▁their ▁host ▁with ▁the ▁products ▁of ▁photos yn thesis ▁such ▁as ▁organ ic ▁carbon ▁and ▁nit ro gen ▁comp ounds . ▁The ▁poly ps ▁supp lement ▁this ▁with ▁the ▁pl ank ton ic ▁particles ▁caught ▁by ▁the ▁widely - sp read ▁tent acles . ▁During ▁the ▁day ▁the ▁poly ps ▁s way ▁and ▁contract ▁in ▁a ▁rh yth mic ▁fashion . ▁ ▁Col on ies ▁of ▁A . ▁gla uca ▁are ▁either ▁male ▁or ▁female . ▁Sp