Lone Neo survivor

[Ato_amare]

A few days ago my shrimp began dying suddenly, i thought it was an issue of water contamination, but my water was testing fine. I decided to move them to another tank away, but they didn't make it . Anyway, Before I did anything to the tank I left it to see if i missed anyone. And apparently I did! Which is exciting, but I was wondering what I should do for him?

The tank he is currently in has a few dead shrimp that fell apart when I tried removing them.

And the only other fully cycled tank has my betta who doesn't seem to appreciate guest.

 

[Andy Sager]

Was there any kind of drastic change in the tank? ( i.e. large water change, large temperature shift, etc.)