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Yes I feed this every day. I just did a 25 percent water change. I will change the feeding to every other day. When I feed the neos that amount daily the food is eaten immediately. And nothing is left . but in either of the cardinia tanks they don’t touch the food ever.

Unfortunately, you are probably still seeing the affects of the ammonia, 2-3 weeks after. Nothing much we can do now except to ride it out and ensure the tank continues to be free of ammonia. Do you feed this amount everyday? Maybe try feeding every 2nd day.

My initial guess for the smell wouuld be the dead snails (and shrimp, but less so) as they really stink and polute the water when dead. The PH and KH are outside the normal accepted parameters so that may have been what caused the deaths? The high KH may have caused the shrimp molting problems etc, have you seen any molts in this tank?. How long had the tank been running, what water supply were you using, did you cycle the tank? Do you know the TDS, I suspect that will be a bit too high also. It may have been a chain reaction from the first deaths poluting the water killing more causing more poluted water and so on! Did you have a regular water change/maintenance routine? Does the tank have filter/light/heater? The more information you can give us the more we will have to go on. Simon