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.
Although much less toxic than ammonia and nitrite; Nitrate (NO3) as a nitrogen compound can also cause stress making a fishâs organs work harder to adjust to their environment, especially at levels higher than 100 ppm in many fish.