i had a ghost shrimp that was left over in the tank during this treatment. should it have been affected by the treatment? if so, how long would it take before it should die? it's still running around and i still have snails in the tank. i only treated the tank once and with 55 drops of some sail be gone stuff that contained copper sulfate. just curious as to how long it would be after adding a 'shrimp' before i should consider adding another one if the tank is 'safe'.