I would do a few water changes - first one around 20% then a few more at 10% and add 1 or 2 snails to see how they do. If ok, then add more. If not, remove and do a few more water changes. It might take a little time as the effects can linger in a tank for a bit.
So here is an update on my clove and fenbendazole situation. A week ago, I separated the soft corals the snails and the starfish into a 10 gallon quarantine tank. So far that tank is doing fine in the main tank, which is 65 gallons was prepared by removing carbon, removing the skimmer cup, but leaving the aeration and then dosing at 2 mg per gallon of fenbendazole. It’s been three days since I dosed the medication. All the remaining corals look stressed as expected, but the clove polyps have turned into white dots, which is also expected. now I have to remove the medication. My plan is to do a 25% water change today and add a double dose of activated carbon. I plan on repeating this three more times over the next two weeks 25% water change and replace the carbon every three or four days until the equivalent of 100% of water change and four double doses of activated carbon in my mind this sounds like it would remove the very vast majority of medication. Does anybody want to comment come confirm or refute this? I understand that a small amount of the 120 mg would be persistent in the sand bed or in the rocks. but I’m assuming that would be a very small amount and overtime. It would reach back into the water column and be absorbed by carbon. Do you think after those four large water changes and carbon doses I’d be safe to put back my soft corals? I only have one large snail and serpent star.
