Hello brother,
Honestly it's kinda hard to make sure what happen with your flowerhorn but I will try to share from what this newbie knows. Hopefully this will help brother....GBU
Limfosistis is con specific caused by fish disease of virus. This disease can groan a large amount of fish, however the attack is usually limited to fish types which has experienced continuation evolution, like family cichild. This disease faction non aggression to cyprinid and cat fish.
This fish disease names comes from a cyst is having white color that accompanying attack. The cyst can in meeting x'selfly (single) nor bunch up at surface of fish body . In a few this cysts case can join forming cumulative structure looking like cauli flower. ( picture 1)
(pic 1. Limfosistis)
Virus Limfosistis basically will groan fish cells so that the cell will be big 50 to 100000 times from it's normal measure. At the time of infection, cells is around cell infection will be able to also is attacked and big so that will form gathering of king sized cells containing many viruses and forms nodule is having colour white.
During a few weeks or month, this nodule will reach measure 05 cm or more. Presence of limfotosis would hardly distrub fish appearance. Nevertheless, known seldom menace life of fish and often loses by itself.
SYMPTOM
infection of Disease in general is started with white having colour small nodule appearance, or grey or sometime pink. Emerges especially at part of fish fin ( picture 2) and doesn't close possibility that they to emerge in part of other body.
(Pics 2. First Symptom)
At initial attack phase, this disease hardly looks like attack white spot. The difference limfosistis will grow is big and the numbers will not counted white spot. Fish attacked by limfosistis seldom shows difficulty is having breath, or glides irregular . Limfosistis can be accompanied by losing appetite at the fish so that not rarely causes fish to become thin.
CAUSE
Disease Limfosistis because of conspecific of iridovirus ( group of DNA virus). This virus has measure 180-200 microns, so that enough difficult to be seen by using simple microscope.
Way of the spreading is unknown categorically. Possibility is from " fraction" nodule that is then causes spread over it virus.
Free virus then will enter and dwells water for several day and hereinafter can enter fish body through injuring skin. Infection through orifice in anticipating possibly happened.
Stress and condition of ugly area is known able to become pemicu attack, or triggers virus that is possible before all dorman in fish body.
PS : Sorry for my lousy english and hopefully you can digest my english..lol
best regards,
jonz88