This will kill all planaria, hydra, snails and snail eggs on the plants as well as any other pests and most algae.

Will planaria zero kill snails?

So there are probably lower concentration of the planaria zero toxin compare to three weeks ago but still enough to make nerite snails sick and probably kill them.

What does no planaria kill?

Note: Biomax NO planaria kills snails and planaria, which causes a lot of waste to enter the water when these animals perish.