yeah, put it inside the constructor
this.hasBeenClicked = false;
Then
show() {
//corps droite
if (this.xspeed > 0) {
here say
show() {
if(hasBeenClicked ) {
new code to display the fish in the small aquarium?
}
else {
// what you have now in show!!!
//corps droite
if (this.xspeed > 0) {
} else {
} //else
} // else