Effect
Destroy as many WATER monsters on the field as possible, then inflict 500 damage to your opponent for each WATER monster destroyed and sent to the Graveyard by this effect.
Regarding the effect "Destroy all WATER monsters on the field. Then, inflict 500 damage to your opponent for each WATER monster destroyed by this effect and sent to the GY":
This effect does not target.
It cannot be activated during the Damage Step.
It cannot be activated if there are no face-up WATER monsters in either player's Monster Zone.
When resolving the effect, you perform the "Destroy all WATER monsters on the field" action. If at least one monster is successfully destroyed and sent to the GY, you then perform the "inflict 500 damage to your opponent for each WATER monster destroyed by this effect and sent to the GY" action. These actions do not happen simultaneously.
WATER monsters in face-down Defense Position and WATER monster cards in the Spell & Trap Zone are not destroyed.
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