My poor fish are in a quarantine tank being treated for both capillaria and camellanus worms using levamisole which seems to be doing the trick for them. I am clearing their normal home now, having nuked it once more with levamisole which doesn't "do" snails or capillaria eggs and figured I might as well nuke them while I am at it. I have fenbendazole here which is supposed to be added to food. No fish in that tank so no food. Will dumping it straight into the water wipe out the pests regardless of their life cycle stage? The tank is also planted if that needs to be considered. Thanks!
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I use the Fenbendazole at 2.5 drops per gallon to treat for worms and gill flukes as opposed to 1 drop per gallon to treat for Hydra. I haven't had any fish react badly to the higher dosage level, but I've never exposed tiny fry, just juvenile and adult fish.
Be aware that the milky white substance settles out onto everything in your tank. You will end up needing to clean out all the hoses with a brush, take out hard scape and thoroughly brush and rinse it, and will need to clean the residue off of your driftwood and plant leaves as well. Magic erasers work well for cleaning plant leaves. At a dose of 1 drop per gallon the residue isn't so bad, but at dosage levels of 2.5 drops per gallon cleaning off residue is absolutely necessary.
My primary use for Fenbendazole is to prophylactically treat wild caught fish in buckets as a dip for a few hours before putting them into quarantine tanks. Then I watch the fish for a few weeks for any further signs of gill flukes or worms and only treat the quarantine tank if I'm suspicious there's a problem (irritated gills, erratic swimming, not putting on weight). If Levamisole is killing the worms in question and doesn't have the milky white residue, then I would stick with that. I've never used Levamisole so can't compare the two medications.