Jay Hemdal
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Oh there is no doubt they feed on fish tissue, you can see that under a microscope with a fresh sample. Indeed, with many fish, the infection begins deep-seated in the fish's muscle - I have no idea how these protozoans get there though.I have came across a paper that suggests uronema can turn to eat actual fish cells, not just the secondary bacteria. Why they do this I don't know. Maybe a high population vs lack of food scenario.
@SaltwaterGuruNeeded If the rock you used was live at some point a lot of these critters have the ability to go dormant. Also possible contamination, or even additives you used might have them.
Jay