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Several months ago I acquired a tank set up from a member here. The tank was taken down but still had its substrate (still wet) and filter (still cycled). I asked the member if he'd noticed any problems with the fish in the tank and he said no. (I still believe he was being honest).
I had the tank up and running in a few hours. Some of my fish went in the next day. About 3 weeks later I noticed a white dot on the anus of one of my endlers. I immediately suspected parasites so I went out and bought some PraziPro. Within two hours of treatment this tapeworm was making its exit. The endler was so hungry the tapeworm looked like a good lunch, even as it was coming out.
Probably trying to eat this thing for the second time in three weeks.
The worm ended up being three times the length of the fish and I had to pull it out of its mouth lol.
I've never seen tapeworms in my tropical fish before and thought this was quite interesting and yes, disgusting. But I think it's a good lesson. Whenever you introduce new plants, fish, water, wood, substrate you're potentially adding new diseases.
(Don't worry Anjie, all fish were successfully treated months ago!)
I had the tank up and running in a few hours. Some of my fish went in the next day. About 3 weeks later I noticed a white dot on the anus of one of my endlers. I immediately suspected parasites so I went out and bought some PraziPro. Within two hours of treatment this tapeworm was making its exit. The endler was so hungry the tapeworm looked like a good lunch, even as it was coming out.

I've never seen tapeworms in my tropical fish before and thought this was quite interesting and yes, disgusting. But I think it's a good lesson. Whenever you introduce new plants, fish, water, wood, substrate you're potentially adding new diseases.
(Don't worry Anjie, all fish were successfully treated months ago!)