do a good job of siphoning the gravel. Then leave the siphon out in the weather. There should be no need to tear down and bleach the tank if the nematodes are killed. The Camallanus are livebearers abd though there are egg-laying nematodes such as the one Charles and that physician are dealing with in St. Louis, I don't think Camallanus has the capacity to rest as eggs and cysts. Burgess has suggested in several places that the free swimming larvae must find a host or die within a day or two.
The recommended second treatment by Charles is a surprise to me, but designed to be really sure the wee beasties are gone. Charles' recommendation that it be left in the tank, until cycled out with water changes should do it in.
Maybe I'm too confident that the Levamisole works. But the bleach wouldn't get the surviving worms in that most all of them would be within the fish anyway.
I do appreciate your concern with children and the fish tank. They do need to be kept out of suspect tanks and that can be easier said than done sometimes. Witness angelhologram's Bad Santa diary from yesterday. Keeping fingers out of mouths is not easy either. (I remember reading in an essay by John Steinbeck that the average American child had injested three bushals of dirt in the course of growing up!.)
The Filaria which was the other situation in St Louis, is a much more serious case. I really hope that doesn't get around the hobby.
All the best!
u.s.
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