Fix: Delfine tauchen jetzt unter die Wasseroberfläche

start_ys=[8,2,5] ließ Delfine nur zwischen y=1 und y=8 pendeln –
genau an der Wasseroberfläche (Wellen bei y=5-8), nie darunter.

Neuer Bogen [10,4,7]: Amplitude ±7, Zentrum y=10.
Delfine spannen y=3 (über den Wellen) bis y=10 (unter Wasser)
und durchqueren die Oberfläche in beiden Phasen.

asciiquarium_ng.py

@@ -1174,8 +1174,13 @@ ygcgwwwww  ygcgwwwww  ygcgwwwww
         masks  = [mask] * 2
         base_x = -13 if going_right else self.cols - 2
 
-        # Three dolphins offset in their path cycle (offsets 0, 12, 24)
-        start_ys = [8, 2, 5]
+        # Three dolphins offset in their path cycle (offsets 0, 12, 24).
+        # start_ys are the y positions at path offsets 0, 12, 24.
+        # With amplitude ±7 and center y=10 the arc spans y=3 (above waves)
+        # to y=10 (just below waterline), crossing the surface in both phases.
+        # Cumulative dy: offset 0→0, offset 12→-6, offset 24→-3
+        # so start_ys = [10, 10-6, 10-3] = [10, 4, 7]
+        start_ys = [10, 4, 7]
         colors   = ['b', 'B', 'C']
         for i in range(3):
             is_lead = (i == 2)