diff --git a/asciiquarium_ng.py b/asciiquarium_ng.py
index 6082e78..0797c0b 100755
--- a/asciiquarium_ng.py
+++ b/asciiquarium_ng.py
@@ -119,7 +119,10 @@ class Canvas:
                     self._ck[row][col] = ck
 
     def render(self) -> str:
-        parts = ["\033[H", RESET]
+        # \033[2J clears the entire terminal (not just our canvas width),
+        # preventing stale characters when the terminal is wider than self.cols
+        # or after a resize.  The full-canvas overwrite below keeps flicker minimal.
+        parts = ["\033[2J\033[H", RESET]
         sentinel = object()
         last_ck: object = sentinel
         for r in range(self.rows):
@@ -461,7 +464,7 @@ class Aquarium:
     # ── Fish ─────────────────────────────────────────────────────────────────
 
     def add_all_fish(self):
-        count = max(1, (self.rows - 9) * self.cols // 350)
+        count = max(8, (self.rows - 9) * self.cols // 200)
         for _ in range(count):
             self.add_fish(None)