I’ve been trying to diagnose these problems for 6 months at least. It all started from either zebra danios or guppies from Petco I didn’t quarantine. I suspect the guppies since they have slowly died off, only 3 left now. Some died from bloating, some died from wasting away. Some developed stringy poop and died. One developed a bent spine but took over 4 months to finally pass away.
After seeing very stringy poop, from everyone including the Pleco, I determined it must be internal parasites. I’ve treated with 4 rounds of Levamisole and 4 rounds of Prazipro. Since then, I haven’t seen any stringy poop. Also have not lost any fish since then.
The remaining symptoms are white patches on the zebra danios backs, and white fin rot on the guppies. The patches come and go on the danios, but they never go away. The fin rot does not go away despite very clean water and every bacterial med out there. Danios have almost completely stopped breeding. The small fish in the tank seem to have stopped growing. I’m starting to suspect a mycobacterium infection (aka Fish TB). Pics of the danios below, thanks for any and all advice.
