What behavior are you using for the player movement?
If he's always animated when moving, you could use (under animations) on any finished.
If he's using platform behavior, you can use "on stopped" under "platform animation triggers" or
use "is moving" but inverted.
If your using 8 direction behavior, you can use "is moving" Inverted.
You don't need to use "every tick". That would be an improper use "every tick".
Hope this helps.