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Hikari Metro

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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


Bath: As a bath treatment use Metro+ for metronidazole-susceptible, microbial diseases of marine and freshwater aquarium and pond fishes (e.g. hole-in-the-head and lateral line erosion), use 1 capful (~10g) per 20 gallons (76L) of water daily to produce a concentration of 5mg/L of Metronidazole. For optimum results, a minimum 30% water change (using Ultimate® or a combination of Liquid Buffered ClorAm-X® and Stress-X) must be made prior to the first and each daily retreatment, until mortalities cease or healing of lesions occurs. Treatments should be consecutive and uninterrupted and could require up to 10 days. If improvement is not noted within three (3) days, discontinue treatment and consider other therapy.

Oral: For systemic (internal) infections, Metro+ can be fed mixed with fish food or preferably used as part of a prepared food. Check out our article on how to make medicated feed. Please Note: Adding Metro+ directly to food provides a potentially bitter coating that could keep your fish from partaking readily.

DO NOT OVERDOSE - this means you should calculate the actual amount of water in your tank by multiplying the length x width x height and dividing by 238 to get the true gallons. Please also deduct the amount of space consumed by substrate (gravel, sand, etc.) rock, decorations or other things which are displacing water.

NOTE: We do not recommend using any sulfur or sulfinite-based water conditioners with this product. If your normal water conditioner does not list the ingredients please verify with the maker that it does not contain these ingredients. If you notice any rotten egg smell to the product, it likely does have these ingredients and should be avoided as it could cause the product to be less effective and the dissolved oxygen levels to be negatively impacted



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