Use Anti Ulcer when fish are suffering any of the following: ulcer like sores on skin; gills are rotting, reddening around fins and skin; fish are emaciated , sluggish and have clamped fins; fish are dying without obvious cause. This treatment has a unique formulation to effectively treat against internal bacterial infections. Do not use with other fish medications This product can be used alongside any Blagdon Pond Water Treatment. Not for use on fish that are intended for human consumption