You can Special Summon this card (from your hand) by detaching 2 Xyz Materials from a monster(s) you control. When you do: You can target 2 Level 4 Fish-Type monsters in your Graveyard; Special Summon those targets in face-up Defense Position. Their effects are negated and they cannot change their battle positions or attack, also they cannot be used as Xyz Materials, except for the Xyz Summon of a WATER monster.