I bought a pair of b/w clowns for my 8 year old tank qt and accliomated them properly(as with all my fish), and my levels are perfect. 2 moths later the male starts jacking his jaw like a tweeker non-stop all day long real fast too and died 3 days later. the female did the same thing but lasted a little longer then died both fish ate, had vibrant colors and no signs of illness other then jaw jacking. all my other fish are healty so what is it?