phosphate 0

@Randy Holmes-Farley I am trying to figure out a solution to aragonite dry rock and dry sand binding phosphate in a new aquarium. Is it a biological process or could I just stick all the sand in a bucket of saltwater and some trisodium phosphate for a few weeks, rinse it off then add it to the...

Hi, I’ve noticed that most of my euphyllia have receded flesh from the bottom (hammers, torches), but they opened fine during the day (maybe slightly retracted but unnoticeable). The only issue I’m seeing is 0 phosphate. I’ve tested twice, Last Friday and today with Hanna phosphate URL. Here’s...