My fancy mouse looked like he had a seizure.

Question

OK. So Max, was put into a box with the other 2 mice I bought. And the three of them got along great. And the box was big enough for the three of them. They were looking out the box. Then like 10 minutes later. [Everything was fine, I was supervising to see if they'll get along] Max started shaking on the side, and it got me worried. So I separated them. And when he was alone he was looking all nervous, and was shaking as if he was terrified and traumatized or something. This happened about 5 minutes ago. So please help me. And the other 2 mice are lab mice. One is brown and is named Bartholomew [brother named him xD]. Then a white mouse with red eyes named Doctor Bosconovitch [other brother named him after Tekken]. Then as noted in my previous question, Max whom I named. And he is black & white.

Answer 1

He must have been attacked by the two of them.  Was there anyway he could have climbed up high enough to fall and injure himself in the box.  Mice will chew there way out of a box.. Don't you have a cage?

Answer 2

Was he responding to touch when he was shaking? Did he move around, did his legs spasm? It's possible he was overwhelmed, smelled something that freaked him out, or that he did indeed have a seizure. Try giving the two new mice a shallow bowl of water to play in so they'll give themselves baths. You might also try introducing them one at a time so it isn't two against one. Mice are actually pretty delicate.