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.
Loss of Appetite. If your fish is not eating or takes food in its mouth and then immediately spits it out, your fish is showing one of the Signs of Stress and Disease. You should be sure other fish are not making this fish miserable. Give fish that are not eating the Recommended Treatment.