* new formulation! Metro+™ is a powdered formula that was developed to offer the hobbyist an effective way to treat lateral line and hole-in-the-head diseases suffered by their pond, freshwater or marine fishes. This revolutionary, extremely safe and highly effective product offers you benefits no other metronidazole-based medication can! Powerful Proven Ingredient (Metronidazole) - Works systemically - Highly effective - Targets the infected areas - Can be used as a bath or with food - Included slime coat replacer helps speed external recovery - Extremely safe