Originally Posted by shabahang
I personally have a kessil a360 and do regular water test and everything is perfect
Perfect doesn't exist. The actual numbers are what we need so we can best help you. A kessil should be more than enough to keep your anemone happy, so this shouldn't be an issue at all. But, it is very obvious on how unhappy your anemone is. Was it acclimated to the tank? To both the water parameters and lighting? How long has it been in your tank since the 'switch'? Try turning off the powerheads to give it a chance to get its footing to start things off, since it is being blown around the tank.