according to Hff's diagnoses i had 2 cardinals that had worms borrowed inside under their scales and eating them, the only was to humanly destroy them so i did with a total of 4 + 1 rasbora either with the worm already or suspect seem like its already got it just incase. anyone else had this problem? cause they said that since the cardinals are still wild caught it is often they get these worms and they havent figured out any other treatment for it?

Prazi actually treats it just fine.

really? so i can treat the whole tank with it? or at a different tank then move it back?

and according to some other fish forum i read, i should treat all infected fish with 5ml of meth blue to 20liter of water on a different tank and then move the fish back but so far i dont have any signs worms or parasites but should i do it to be safe?

If you use prazi just treat them in their tank. Meth Blue shouldn't do much for treating worms but if you do use it be aware that it will stain the silicone in the tank. I believe this is why people say to use meth blue in separate tanks.

I have used it in my display tanks and I'm the only one that can tell - the silicone is only slightly changed so don't let it worry you if you only have the one tank.

more info http://www.fnzas.org.nz/fishroom/viewtopic.php?f=25&t=40813&hilit=cardinal