Flatworm exit really is a great product.
I suggest you use it and do a 300-500% water change if you are that worried about crashing.
IE double dose 100% water change, wait a few minutes 100% water change, a few more minutes another 100% water change and repeat the process until you are satisfied you've gotten all the dead ones. Doing the water changes with a turkey baster and airline tube you should be able to get them all.
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