Berghia Nudibranchs

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It's actually not that bad, and when compared to how long it would take for them to be eaten. Generally it kills in one dose so if you did 5 or six a day and just add in an extra water change you should be okay. Just get a syringe inject it into the stem and give them a few mils. Check in it in a few days. You could also get something to adjust your ph if it starts to go up.