My discus tank had some type of crazy bacteria going on so I purchased 500 grams of pure metrodinazole which is probably the one the best medication for bacterial infections. I had to get it shipped overnight and I have a lifetime supply willing to split the amount with either 100 or 250 grams for 35 or 75 bucks which should also last you a lifetime. I paid close to 200 including shipping. Most fish stores don’t carry pure metrodinazole And don’t be like me scrambling to save your fish before it’s too late.

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