To aid your fish in fighting off harmful illness, vitamins and supplements can be provided.
Things to Consider:
Not just fish -- There are several treatments available that are beneficial for coral, reefs, anemones, and algae.
Stress control -- Fish can become very ill if they become too stressful. Supplements can be added to aquariums that help calm fish and reduce stress.
Scale loss? -- If your fish are prone to scale loss or fin damage, products such as Wellness Fin Guard, will apply a thin coating to help protect your fish.