to such a horrible illness as Camallanus! I can't recall the precise figure, but a percentage of commercial fish (10%? 20%? 30%?) will have been exposed to it.
That is why a couple of us have been pondering treating with a specific anthelmintic or dewormer while the new fish are in quarentine. If you bought five new fish from two or three sources, what are the odds that at least one of them has camallanus?
Why would you need to redo your tank? What will that solve? If there are no other fish in the tank and you can leave it for a couple of weeks the camallanus larvae will starve and die out.
The above assumption doesn't take snails into consideration. I flat out don't know if they can carry camallanus, but worry that they might. Some data seems contradictory in the few studies I've found. (One says no, one says yes .... that sort of thing.)
If there are other fish in that tank and/or (possibly snails or tiny crustaceans) you need to treat it. If you have a net you have used there, either that needs to be sun dried or also left in the tank when it is treated. If you opt for treatment make sure that the filter, thermometer and other "tools" are also included or bleached elsewhere.
An advantage of treatment is that the tank doesn't need to go through extensive recycling.
Any tank which has had it's fish load removed should be restocked with just a pair or two of fish if it sits a long time without residents. It's carrying capacity will have been much reduced because many of it's "good-guy" bacteria will have starved for a lack of ammonia and nitrates.
By the way, I had some green snakeskins waste away - and I treated them for camallanus upon arrival and, a couple of weeks and water changes later, for hexamita. I still don't know why they cashed it in.
In a wierd way, if we can identify what killed them, we at least know what an enemy is. I'm troubled because I don't have a real strong explanation. But I can sympathize, maybe empathize with what you've gone through.
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