Loach problems again.

[Eupterus]

Woke up this morning to one of my kuhli loaches laying on si back gasping for air. All six have been there for a while now and I thought I was over this mystery loach dying thing. Is now in a 1 gal with an airstone running.
The loach in trouble looks on the thin side so hope I am not underfeeding or the bettas are eatting their food away from them when I'm not looking.

 

[Lupin]

Water parameters please.

Is this yours? Situation is similar to yours.
http://forums.loaches.com/viewtopic.php?t=9672

 

[Eupterus]

Yeah...Unfortunately I have to run...Will test for nitrites when I get back..

 

[pinkertd]

Eupterus, is this the tank you added your new bettas to just about 2 days ago? If so, you may have introduced something bad from the new bettas.

 

[Lupin]

Yeah...Unfortunately I have to run...Will test for nitrites when I get back..

Ammonia, nitrites and nitrates.