Taken from my forum at the flowerhorncraze...
Hexamita
Symptoms: The first symptom of slimy, white mucous feces, even while still eating and acting normal. Further signs are the fish hiding in the corner it's head down, head above the eyes gets thin, they blacken in color, and swim backwards.
Hexamita are intestinal flagellated protozoa that attack the lower intestine. Discus and other large cichlids, especially Oscars, are especially prone to Hexamita. As it is a disease of the digestive tract, a wasting away or loss of appetite may be experienced.
RE: Treatment(ako ni experience and mao ni gi prescribe sa amo fish doctor sa forum nga si Dr. Lane a.k.a Roundhead)
Only treat your fh for hex kung dili na mokaon, head down and staying in the corner... White poop doesn't usually mean nga nanay hex imo isda... Observari sa brad...
i advise you to do a water change then add salt to your water... Next is to pump up the temp a bit higher and then palit og flagyll(metronidazole) sa botika(tag baynte kapin na cya), dugmoka then add to the water... 1 tablet per 50 gallons of aquarium water... It is also advisable to refrain from feeding pellets to your fh while he is under treatment... Only feed Frozen Blood Worms...
diara ang step by step instruction on how to treat hex...
step 1... do wc
step 2... add salt
step 3... set temp between(86-89)
step 4... add metronidazole
step 5... do 10% daily
he should be back to normal in a week to 10 days...
Hope this helps...