2 bettas and 1 white cloud lost

This is getting serious. Just found 2 bettas and 1 White Cloud Mountain fish dead this morning again. Saw 2 other bettas biting on the dead WCM.

The red CT is still discharging white stringy poop. Doesn't look too good. 

Testing the water for ammonia but it's still within normal range so I suspect it might be something to do with the tubifex. 

As a precaution, I've separated the betta juveniles (now 7 left) into a previously decommissioned tank and will be getting some meds to see if I can stop this unfortunate series of deaths. 

Lost 4 little fellas

Over the weekend, I lost two whites and a blue betta juvenile. One of the whites had its stomach eaten and had no eyes while the other two were totally intact.

On Tuesday when I got into office, I found another red lying dead as well. 

I suspect it might have to do with the tubifex worms that have been around for more than a week. 

The red CT female doesn't look too good and I hope she doesn't succumb to any illness or bacteria that might be present in the tank.