When you have an employer group health plan and want to apply for Medicare, the work status of the policy holder (you or your spouse) affects whether or not you will be in a Coordination of Benefits period.
Copper is an excellent treatment for saltwater ich or marine velvet disease, but it can be toxic and stressful to fish. Of course, using it is much better than letting a fish die from velvet, but it should never be used in a tank with healthy fish. Improper nutrition is also a commonly overlooked stressor of fish.
Many commercial Ich treatments utilize copper to kill the Ich parasite. This is fine in fish only aquariums, but copper is toxic to aquatic invertebrates like snails, crabs, shrimp and crayfish. So if your sick fish are sharing an aquarium with invertebrates, what's your best course of action?