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I recently dosed my 3 foot tank with No Planaria in my 120L/3ft taitibee tank. I dosed under the recommended dosage but after the 3rd day started seeing dead shrimp. It was only 1-2 on day one so I did a 40% water change and added an internal filter with carbon to try and get the rest of the no planaria out of the tank. It's day 5 now and I'm still seeing shrimp deaths. Yesterday was the worst with about 10 and this morning was 5 found dead. I always seem to find them in the morning and none seem to die during the day. Tank has 2 large sponge filters and a internal power head filter(normally don't use this one but needed for the carbon). I have added an airstone today in case it is lack of oxygen. Tank is planted but not heavily. Mostly java ferns, anubias and subwassertang with a few floating watersprite. Ammonia 0, Nitrite 0, Nitrate 20, KH 0-1, Gh - 4, TDS 120. How long would it take to get the No Planaria out of the tank and are these deaths possibly just residual from the initial dosings? I'm doing another 20% water change today and hopefully the deaths will stop soon or is it possible my whole colony is doomed already? Remaining shrimp seem to be acting fine and haven't seen any odd behaviour in them at all. Any advice is greatly appreciated and thanks in advance.