I have a male betta in a planted 10 gal. I never lost a single ghost shrimps before I put the betta in, but ever since he joined the tank, I lost five cherry shrimps and five ghost shrimps. I put six more ghost shrimps last month, but now they are down to two. I am taking my betta out since he suddenly decided to harass all other inhabitants. He had been getting along with them (other than hunting down shrimps) for almost 4 months, but now he started chasing my neons and corys to death, so I really have no choice.