string fish poops

it may be hard to believe but..many fish are infected.,.the parasites may live in the host with no problematic signs or only mild distress.
I had the same experience. Nearly all fish I got had internal parasites.
 
I have tiger barbs also, and I have also seen the "string" poo. They seem fine and I have had them since Sept. Are they necces. internal parrasites? Are there any other symptoms?
 
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