Infected tank. Please help

[Nilsha Pathirana]

Hi guys, can someone please help me.
I have a 95l tank planted tank with 4 cardinals, 5 emperor tetras, 4 rummynose tetras, 6 harlequins, 4 corydoras and a pleco. I do partial water changes 2-3 times a week.
Water parameters are 0 ammonia 0 nitrites 10-20 nitrates.
4 of my emperor tetras have tiny white worms on their fins and tail. One of them got a white worm on its body and one of his gills has turned red. One of my cardinals has two clear bubbles on his face and gills. One of them got a white worm on its mouth. My rummy noses and harlequins are fine. I have no idea what’s going on. I have bought a uv steriliser and it’s getting delivered on monday. Will that help or do I have to treat my fish.

 

[the loach]

I can see nothing on the pictures, but your description is very alarming; as it sounds just like Dermocystidium, which is a terrible disease for which there is no cure. Euthanize all affected fish ASAP. Do not get any replacment fish for at least 6 months. The remaining cardinals and emperors might get affected in this period, the disease starts with a dull spot on the body. The only good news is your harlequins and catfish are immune to the disease, the rummynoses probably but not sure. They are not worms but parasitic eukaryotes... the "worm" consists of millions of spores.
You bought either the cardinals or emperors in the past half year?

 

[Nilsha Pathirana]

I found these photos online. They look very similar what my fish got. They are tiny worms emperors got them on there fins and tails and one of them got it on it’s body and one of my cardinals got it on the mouth is that dermocystidium?

 

[the loach]

Yes. They look like worms but they are not. It's a growing tube of spores.

 

[fishorama]

The only thing I saw was on the emperor's body in your first pic...but if tl is correct...& by the blistering sores he is...that's a new disease to me.

I did a quick google but did not see any treatments...I'm so sorry...it looks like rummies can get it too...Gee whiz, I wish we could help in some way...but it looks grim...

 

[Sprinkle]

If there is no treatment, I would go with euthanising the fish like it was said.