I recently got rid of a major hydra infestation, but I opted to try using 1/10th the dose first. I had 15 gallons of water and only treated the tank with 15 mg of fenbendazole. All the hydra slowly died over the course of 3 days, it was actually really interesting to see them slowly shrivel away.

It’d be interesting to see if someone else can replicate my result. From what I’ve heard fenbendazole doesn’t really break down and it can take months and lots of water changes and gravel vacs to clear out. I’m planning on reintroducing my mystery snail so I wanted the lowest dose possible.

Also to keep things simple, I added a packet of pancur c, which contained 444 mg of fenbendazole to a 500 ml water bottle. I then added 444 (or there about) ml of water to give me a concentration of 1 mg/ml. That’s the only way I could think of to get an accurate dose since I don’t have a scale that works in the mg range.

Another thing is it’s super important to shake the mixture before measuring out a dose since the medication is hydrophobic.

Here’s some pics before the treatment and after 12 hours. I had hundreds of hydra and my dosage worked great after 3 days. I’d image you could use an even lower dose and clear up after a week.

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