So I have has Petri, the figure 8 puffer, for about two years now. I noticed his poo changes hue depending on what I feed him. Now last week I, stupid me, had out about 10 ghost shrimp into his 50 gallon tank. Now normally I would take him about a week to eat those, picking them off one by one. Well, he and his buddy Pauly either know all of their hiding spots or they just are getting too good at hunting and I woke up to puffers with giant bellies. I fasted them for 4 days and their stomachs have come down nicely. However, today Petri has this lil pink nub hanging out and he's been wrestling it all day. I think it's just poop, but I am worried it's an internal parasite. Googled failed to satisfy me so here I am. Help! 
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) It has two figure 8 puffers under 2 inches. I vary their diets. They eat brine shrimp, blood worms, ghost shrimp, clams. I fast them at least 1 to some times 2 days a week. (Depends on if they look) 
