<P> my aro had some kind of white string on the back on da tail how do i treat him .. do i treat him alone or the whole tank and ma tank is 125 gal , i had some fish in the tank too FH , and gar</P>
I had these on a ranchu. I actually physically removed the worm from the fish and treated with clout. Of course, gold fish are a little easier to deal with out of water than an aro. I used a styrofoam cooler with some water and stress coat, wore rubber gloves and pulled it with tweezers.