Right, but in this situation, none of those concerns really matter, he’s not running carbon indefinitely, he’s running it short term to remove toxins. In this context, he had carbon on hand, and you said not to use it, should he really have not used it and waited until he could get Chemipure while his tank was dying so as to avoid stripping trace elements, HLLE, and leaching phosphates? I normally wouldn’t make such a big deal about someone’s advice but in this case, if he took your advice, it could’ve been the difference between a living tank and a dead tank.Chemipure WAS recommended. Activated carbon can also remove the trace elements and minerals that are important to your fish, invertebrates, and corals. Studies have found that the heavy use of activated carbon in marine aquariums can cause Head & Lateral Line Erosion disease (most often seen on fish in the Surgeonfish Family) and main concern using carbon in a saltwater system is that carbon often leaches phosphate into the reef tank whereas Chemipure will keep it in check
And again, I really do respect your opinion and experience, but there are a lot contradictions here. So, activated carbon causes all these issues and is bad, but Chemipure, which is mostly activated carbon, doesn’t cause all these issues and is good? Chemipure Elite will control phosphates, Blue will not, but neither (including activated carbon) will leach phosphates if changed regularly. But again, in this situation, none of that is relevant, as he was running it short term to remove toxins.