Fenbendazole

[saltgogi]

I will be using this to treat my tank for hydroids:

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Question is, how much to dose. I am reading that it should be 1.5 mg per gallon of water. And some say 100 mg per 10 gallon of water.
I'm sure somebody has experience with this treatment. I will be removing all snails and anemone during treatment and do more than the recommended 25% water change after 30 hours.

 

[Courtney Aldrich]

I just went to my LFS, who regularly uses flubendazole (a very closely related compound with nearly identical activity) to prophalytically treat their fish and the dosage for flubendazole is 12 mg per gallon. I have not used it and cannot find much information on fenbendazole, but the few posts have a range of doses. I would start out with the lower dose of 1.5 mg per gallon. You can always increase the dose if you don't see an effect.

 

[saltgogi]

I just went to my LFS, who regularly uses flubendazole (a very closely related compound with nearly identical activity) to prophalytically treat their fish and the dosage for flubendazole is 12 mg per gallon. I have not used it and cannot find much information on fenbendazole, but the few posts have a range of doses. I would start out with the lower dose of 1.5 mg per gallon. You can always increase the dose if you don't see an effect.

That sounds like a good plan!
Guess i'll start with low dose and slowly work up until it works. Thanks!

 

[Courtney Aldrich]

I found this thread that gives pretty detailed information on fenbendazole dosing. The dosing is 10 mg per gallon. I would dose just once.

Fenbendazole dosing to rid tank of hydra

www.plantedtank.net

 

[saltgogi]

I found this thread that gives pretty detailed information on fenbendazole dosing. The dosing is 10 mg per gallon. I would dose just once.

Fenbendazole dosing to rid tank of hydra

www.plantedtank.net

This forum says 0.1 grams / 10 gallon which would equal to 100 mg per 10 gallons.

 

[Courtney Aldrich]

This forum says 0.1 grams / 10 gallon which would equal to 100 mg per 10 gallons.

Yes, that is correct. I said 10 mg per gallon, so 100 mg for 10 gallons. Sorry for any confusion.

 

[saltgogi]

Yes, that is correct. I said 10 mg per gallon, so 100 mg for 10 gallons. Sorry for any confusion.

ahhh no i read it wrong lol.
This is for freshwater. Im assuming it applies for reef tanks too?
I'll probably remove all snails I see and my anemones during the treatment just in case.

 

[Courtney Aldrich]

Yes, I think you should remove all invertebrates. After the treatment is done (~3 days or whatever you think is best), I would add carbon to absorb the drug (don't use the cheap carbon that easily breaks and forms dust, but Rox0.8 as recommended by Randy (https://www.bulkreefsupply.com/bulk-premium-rox-0-8-aquarium-carbon.html). The carbon should rapidly remove everything from the water column in 24 hours, but you might want to supplement with a water change before reintroducing invertebrates (if you're concerned about residual drug leaching out of rocks, etc.. you could introduce a couple of snails first).

 

[saltgogi]

Yep i have rox in the reactor. I'll rerun once the treatment is done

 

[Tamberav]

I believe it can kill soft corals too. So if you have a bunch of those, I would remove them. I wouldn't want soft coral toxic soup.

 

[saltgogi]

I read zoas would be fine. But i guess mushrooms would suffer from it?

 

[kartrsu]

I read zoas would be fine. But i guess mushrooms would suffer from it?

Any updates on how this went for you?

 

[saltgogi]

Decided its not worth the risk and ive seen less numbers with less feeding.

 

[Reef and Dive]

This might help:

Here it is! Fenbendazole use against hydroids

Hi all! Well after getting a lot of questions about the use of fenbendazol I figured I would write this up. This is for informational purposes and I will not be held liable for improper use. Fenbendazol must be used exactly as I instruct or run the risk of a tank crash. Now lets get to it! So...

www.reef2reef.com

 

[Reef and Dive]

I read zoas would be fine. But i guess mushrooms would suffer from it?

Mushrooms do well.
Octocorallia and Gastropods don’t.

 

[saltgogi]

I still dont trust it lol.
I've sprayed some with aiptasia x before since it seems to kill whatever it touches and it seems to have worked for me.
I'm going to try kalkwasser paste to see if that works too since i'm running out of aiptasia x soon. If it doesn't work, i'll probably order more aiptasia x.

 

[kartrsu]

This might help:

Here it is! Fenbendazole use against hydroids

Hi all! Well after getting a lot of questions about the use of fenbendazol I figured I would write this up. This is for informational purposes and I will not be held liable for improper use. Fenbendazol must be used exactly as I instruct or run the risk of a tank crash. Now lets get to it! So...

www.reef2reef.com

I did this treatment after watching your video. I have done my 25% and first 10% water change. My digitate hydroids are all retracted, but how will I know if they are dead? Do they fall off the rock?

@saltgogi, I was curious your experience since you mentioned a much higher dosage at 10mg per gallon vs 1.5mg per gallon per suggested in the fenbendazole vs hydroid thread.

 

[Reef and Dive]

Do they fall off the rock?

They don´t. They shrink and dissolve. Some of mine went away days after the treatment...

 

[nano_reefr]

I did this treatment after watching your video. I have done my 25% and first 10% water change. My digitate hydroids are all retracted, but how will I know if they are dead? Do they fall off the rock?

@saltgogi, I was curious your experience since you mentioned a much higher dosage at 10mg per gallon vs 1.5mg per gallon per suggested in the fenbendazole vs hydroid thread.

Did you use fenbendazole to remove digitate hydroids? I unfortunately suffered from it. Can you help me to remove them?

 

[kartrsu]

Did you use fenbendazole to remove digitate hydroids? I unfortunately suffered from it. Can you help me to remove them?

It’s ineffective even at higher doses. Perhaps I didn’t do repeated doses but it also really impacts the biome. If I was to try it again, I would do the recommended dosage but repeat at least 3 times, maybe a week apart each.