That looks like it could be a tubifex worm; have you ever fed those worms to your fish? Tubifex worms can easily survive in the aquarium gravel.
When gathering plants from the wild, I have noticed various small worms, such as the white ones you mentioned, get into my tanks. As far as I have seen, the fish eat these with gusto! They quickly tend to disappear in my tanks as I run UV on all of them.
I do notice the reddened gills on your fish. When I have seen this before, it has usually been from excess ammonia/nitrites in the water.
However, it does sound like your fish might be suffering from some form of parasite(s.) The furan you treated your tanks with is only for bacterial infections. I am guessing your fish probably had some secondary infection in addition to the possible parasitic disease--you probably only ended up treating the secondary infection; and, now the primary cause of disease is beginning to spark the secondary infection again.
Might be worth trying the praziquantel, or a similar product ...
Regards,
TA
When gathering plants from the wild, I have noticed various small worms, such as the white ones you mentioned, get into my tanks. As far as I have seen, the fish eat these with gusto! They quickly tend to disappear in my tanks as I run UV on all of them.
I do notice the reddened gills on your fish. When I have seen this before, it has usually been from excess ammonia/nitrites in the water.
However, it does sound like your fish might be suffering from some form of parasite(s.) The furan you treated your tanks with is only for bacterial infections. I am guessing your fish probably had some secondary infection in addition to the possible parasitic disease--you probably only ended up treating the secondary infection; and, now the primary cause of disease is beginning to spark the secondary infection again.
Might be worth trying the praziquantel, or a similar product ...
Regards,
TA
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