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Small medusae pulsing around inside the window. Each squeeze of the bell is the thrust, so they shoot up and then sink back through the water they just cleared. Tilt for a current; shake or shout and they bolt.
How many share the tank. On a 48x64 panel a few big ones read better than a crowd.
Bell width. Big ones have less room to roam — the visible window is only about 34 px across.
How far each squeeze carries them. At zero they hang in the water and just breathe.
How often the bell contracts. Slow is a deep-sea drift, fast is a panic.
Density of the stippled fringe around each bell. Zero gives hard silhouettes.
How much a shake or a loud noise startles them.
Your settings are compiled into the slot when you install, so the Puff runs exactly what you see here.