Random or something to it?

Just had a quick note...

...I had a clutch of pastel x normal hatch out the average odds; 2 pastels and 2 normals.

Now, I put them in a holding tub and from time to time I check on them, inspect them, etc.

When I put them all back in the tub, in random placement/positions mind you, the two pastels always go into the hide, and the two normals congregate at the back of the tub, and this has happened the same way ever since they hatched.

After a while one starts to think there is something to this, but I wanted to see if anyone else ever experienced such seemingly un-randomness.

In a funny way, it seems as if they are segregating themselves, but I can't seem to think how it would be possible.

BrandonsBalls