Hello everyone. I work with a saltwater aquarium with a bunch of fish but recently some of the bamboo sharks developed goiter. I have had success in treating that in other sharks with potassium iodide by putting it in their food. However, these bamboo sharks refuse to eat (we even tried coating their food with garlic oil, no result). They are currently put in a separate quarantine tank so more attention can be payed to them. This tank, however, is part of a system consisting of three tanks linked to a single sump and one of them houses a new Pomacanthus fish which is still going through it's initial quarantine period. My question is - if i were to dose the potassium iodide in the water instead of giving it with the food, would that harm the Pomacanthus in any way? It still has to be quarantined for about a week more.