hey everyone, I've been searching the forum but haven't been able to find an answer to my question and my cephs arrive in less than 3 hours! I'm building a temporary holding tank to store them, its a temperature controlled container filled with saltwater with air bubbling through the water. Circulation is achieved via the air. I just made up my saltwater using Instant Ocean, turned on the air, and the water turned brown after a few hours. Am I missing something here? I realize that I'm missing many vital items for a true aquarium, but this is just a short holding tank and I'm just trying to make the saltwater. Thanks!