Was just in key West. Lots of emerald and hairy crab species. Lots of red coloration and plant life and in only 20 feet of water. Rinse rock well as it is Sandy and lots of pores filled with who knows what
Rinsed it a little before initially placing in tank but yesterday I went through the rock with a powerhead blasting every hole I saw.. looked like a grey snow storm in the tank ;Wideyed, syphoned out what I could doing a water change after it settled