Neon tetra growth (disease identification help)

RicoRodrigues

Tank
17gall/65ltr
Running for over 2 years (moved from a 10 gall/40ltr that was run for over a year before that when we got the corys.)
Has a hang on back filter with fine sponge pre filter and insides replaced to hold more media (currently running charcoal filter to remove meds as I have transferred the tetras to a 5 gallon bucket hospital tank running a sponge filter)
Has a 50w heater
22c water temperature
4 Cory’s, 1 albino pleco, 1 long fin pleco and the 7 tetras that have been moved to the hospital bucket

Maintenance
Usually change about 20% of the water once a month as the plants do a decent job of balancing the water and I work fifo 3:1 roster.
usually just fill the sink the night before a water change (with half boiled water) to let the chlorine off gas.
as the substrate is fine gravel/sand I usually just gravel vac the top and every 3 months or so I fully gravel vac 1/3 of the substrate.

unsure exact numbers on water parameters as I don’t have any test kit atm

Fish get fed small pellets daily that the tetras eat and the Cory’s usually find any extras along with picking off the smaller snails and the Plecos get and algae wafer twice a week to every 2 days depending on if they jump straight on it/seem super hungry.
also once every fortnight to a month they get fed froze blood worms/brine shrimp instead of the regular feeding and everyone in the tank seem to smash them

Had the tetras about 3 years and have lost 3 to unknown causes whilst I’ve been away at work (suspected over feeding that prompted and educational speech to the missus and my 5yo who we got this tank for)
The first one had a growth on the mouth probably about a year ago and just seemed like a fatty tumour perhaps and didn’t affect colour or behaviour as far as I can tell (he’s the biggest one and always a good eater at feeding time)
Then others started to get white spots on the tips of their fins and one of them has a raised patch of scales on the side.

I have started out by increasing salinity to .2% in the main tank and adding pimafix for 5 days to stop anything spreading when I noticed that more tetras had markings on them and vacuuming the top of the substrate daily. I have now moved the tetras to the hospital bucket and did a 50% water change in the main tank because of the Corys and plecos I will probably do a daily 10% change for the next week to lower the salinity in the main tank back to normal.

The LFS we got the tetras from doesn’t appear to be great as some elephant ear guppies we got from there died not long after purchase (about 3years ago when we setup) and we have never been back to them (all the catfish were from another LFS)

No real apparent behaviour change still healthy appetite.
Hopefully the pics can help with identifying what this might be.
If you got this far thanks for reading my novel
 

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