if it is comming out of an established tank then it has already been cured so i think there is little reason to scrub the rock. the reason it is checked during inport is due to sponges etc. that die off and put off a lot of pollutants. i would recomend getting it in your tank fast to reduce as much die off as possable. to get a lot of coraline growth i have herd a lot of people recomend a two part calcium supplement like b-ionic. ;)



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