When I say clean the gravel, I mean use a gravel cleaner on the gravel in the aquarium. You leave the gravel in the tank and use the gravel cleaner to suck out any gunk and worms or eggs that have been expelled. There is no reason to remove gravel from an aquarium if you use a gravel cleaner.
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Praziquantel is normally used to treat tapeworm in cats and dogs. I don't know of the dose rates if you use cat and dog pills for fish.
Levamisole is normally used to treat livestock for some types of thread worms.
Most of the guys in the American rainbowfish groups use Flubendazole, which is or was available in the US. Check Amazon for that instead of Praziquantel and Levamisole.
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Praziquantel is normally used to treat tapeworm in cats and dogs. I don't know of the dose rates if you use cat and dog pills for fish.
Levamisole is normally used to treat livestock for some types of thread worms.
Most of the guys in the American rainbowfish groups use Flubendazole, which is or was available in the US. Check Amazon for that instead of Praziquantel and Levamisole.