Fish now swim in schools — and they finally stay level

This update is all about how the fish move.

Schooling

• Fish of the same species now swim together. Each school follows a leader and holds its formation instead of drifting apart, so a tank full of neons reads as one shoal rather than twenty separate fish.
• Formations spread out in depth as well as side to side, so a large school fills the tank naturally instead of stacking into a single flat band.

Bodies that stay level

• Fish no longer tip their heads up or down when they swim vertically. Bodies stay parallel to the floor at all times. The old tilt made a fish rising to the surface look like it was standing on its tail.
• New squash-and-stretch motion replaces it. Bodies compress and extend in time with the tail beat, so you can still read the burst-and-glide rhythm at a glance — just without the nose in the air.

Pacing

• Cruising speed now drifts gently up and down instead of holding one flat value, which makes the tank feel alive rather than mechanical. The variation is deliberately subtle — wide enough to notice, narrow enough that nothing looks like it is stuttering.

Swimming boundaries, feeding, breeding and every other tank behaviour are unchanged.

The demo receives the same update.