what is the best way to treat? It looks like white and stringy with round balls ,hour glass shape .the medicated food they spit out.
+1 but sometime the hourglass shaped poop is flat worms.PraziPro is a dewormer, from the description of the OP's fish it has hexamita aka spironucleus vortens.
Read this:
http://www.monsterfishkeepers.com/forums/showthread.php?339362-Treating-Hexamita-aka-Spironucleus
This should work, but you'll need to get the 3% solution down his throat manually.