Colu

Possibly corydoras elegans

Could be columnaris that's a gram negative bacterial infections that spreads more quickly at temperatures over 75 and can kill in 24hr to 7 days depending on the stain I would usually recommend treating with kanaplex and jungal fungus clear fizz tabs containing nitrofurazone following this treatment plan kanaplex and nitrofurazone can be harmful to shrimp so what I would do is two full course of maracyn2 active ingredient minocycline back to back @IntrepidUT99

Yes I would do a water change and start treating with ick X straight away I would stop using paracleanse

That looks like ich to He's how you tell the difference between ich and epistylis if you dealing with ich for that you would want to treat with ick X and a small amount of aquarium salt 1 table spoon for 5 gallons as ich causes massive electrolyte loss and the salt will add back in essential electrolytes if it were dealing with epistylis you want treatment with ick X and maracyn2 in food feeding a small amount twice a day for 7 days

Looks like it's injured itself am not seeing any fuzzy appearance that would indicate a fungal infections what I would do is add Indian almond leaves as they have antibacterial and antifungal properties you might have to add one leaf per gallon to get a beneficial effect and monitor give an update if it gets worse @haliboo

I would leave it at least 4 weeks before adding new fish if he gets worse or other fish develope the same lumps then you more than likely dealing with neon tetra disease I wouldn't add any new fish to this tank I would essential quarantine this tank till you have no fish left then break it down and disinfect everything with a 3% hydrogen peroxide solution then let dry then repeat the process again and add a UV sterilisers for a minimum of 4 weeks before adding new fish

I would have it ready just in case you need to use it I would add an extra sponge filter to your main tank so you will have some cycled media ready

Am not seeing any Reddening to the edges of the fins that would indicate an active infection clear edges to the fins are sign there starting to heal what I would do is add Indian almond leaves as they have antibacterial and antifungal properties you might have to add one leaf per gallon to get a beneficial effect and monitor if you notice his fins start to get worse than I would do a course of kanaplex it's a broad spectrum antibiotic treatment it won't harm your pleco @Liberty

I think @tolstoy21 keeps these so maybe he can chip in I have no experience with zebra acara to say whether this normal or not

Yes you could get away with a 5 gallon bucket add a small heater and a sponge filter If this is the tank your treating I would wait till you have resolved the issue before adding new fish

It's not uncommon for fish to have ich and epistylis at the seem time epistylis that feeds off of gram negative bacteria on the slime coat of your fish and spreads more quickly at higher temperatures what I would do is gradually lower the temperature and keep treating with API super ich cure and do a course of maracyn2 in food feeding a small amount twice a day for 7 days if there not eating than i would dose tank with maracyn2 and add a small amount of aquarium salt 1 table spoon for 10 gallons @ViperRT10Matt

Yes you can do this I would recommend getting a small quarantine tank if you can't you can use a plastic tote as a temporary quarantine Its fine to dose your display if you have shrimp in your tank kanaplex can be harmful to them

I wouldn't recommend using that tank

He's how you tell the difference between ich and epistylis @Confetto

If it looks like the picture then it's more than likely neon tetra disease I couldn't rule out a bacterial component neon tetra disease is spread when an infected fish dies and your other fish eat it and ingest to many pleistophora for the immune system to handle and it becomes overwhelmed they can have neon tetra disease for a long time it's only when I period of stress that weakens there immune system that you start to symptoms they usually died with in two weeks of showing symptoms it can infect angelfish danio rasbora barbs guppies goldfish other tetra species it best is to remove any fish showing symptoms to a quarantine to prevent them getting eaten if they die in your tank two options monitor or you can do a course kanaplex and salt just in case there's a bacterial component and it's not neon tetra I can never be 100% there always a possibility some else is going on @NikkiRae I use to recommend kanaplex in food before a vet told that it is very ineffective and can damage the gut flora in your fish

Looks like an injury I would add some Indian almond leaves as they have antibacterial and antifungal properties you might have to add one leaf per gallon to get a beneficial effect if you notice it getting worse then I would do a course of kanaplex @Maximus

Looks like a snout chondroma that's caused by neon tetra disease there's no treatment currently available he's a picture for comparison @oogabooga I wouldn't recommend kanaplex in food as very little of the medication is adsorbed by the intestinal tract so it's not a lot gets into the blood stream your better off dosing the tank with kanaplex maracyn2 is much more effective in food @NikkiRae

Metronidazole isn't very effective at treating ich you ick X or kordon rid ick plus or seachems paraguard I would also add a small amount of aquarium salt 1 table spoon for 10 gallons as ich causes massive electrolyte loss and the salt will add back in essential electrolytes just remember to only put back in what you take out so if you do a 10 gallon water change put 1 table spoon of salt back in as salt only removed though water changes @Confetto

Could be caused by an injury I would add a small amount of aquarium salt 1 table spoon for 6 gallons at that level most plants are fine and add some Indian almond leaves as they have antibacterial and antifungal properties you might have to add one leaf per gallon to get a beneficial effect if you notice the eye start to swell or any Reddening then I would do a course of maracyn @Mattlikesfish36

Small pin head cricket that you get for reptiles would be good to feed your archer fish

Just for 24hr till you do a water change to remove the medication if you are dealing with internal parasite it can take a minimum of 4 full courses of treatment with levamisole you could try adding a small amount of garlic guard to there food to try and simulate there appetite try feeding some live foods such black worms daphnia

What I would do is treat the tank the archer fish were in with three more courses of expel p one week apart after 24hr do a thorough gravel vac to remove as many eggs and expelled parasite black out the tank during treatment as levamisole is a light sensitive medication What are you feeding them and how often

I would also use aquarium salt alongside the funox

First your angelfish could had over production of the slime coat that can be caused poor water quality a parasitc infection such as flukes. If it were flukes you would want to treat with prazipro every two weeks for 4 full courses of treatment so you would treat on week 1 week 3 week 5 week 7. You can also get the symptoms you described with Grey patches on your angelfish with chilodonella and costia. he's a picture for comparison. for that you would want to treat with malachite green and formalin active ingredient in ick X. gills red Gills on your Tetra's can be caused by ammonia burn cholrine or Gill flukes. your Otto looks like they had a bacterial infections could be columnaris that's a gram negative bacterial infection that spreads more quickly at temperatures over 75 and can kill in 24hr to 7 days depending on the stain. the most effective treatment I have found is a combination of kanaplex and jungal fungus clear fizz tabs containing nitrofurazone following this treatment plan. The other dead otto in the bag that could be postmortem changes depending on how long its been dead in your first microscope slide. am not sure that's microsporidia in your second slide it looks like fish waste he's a picture of Gill flukes for comparison if it's moving it could be fluke's it looks like fish waste to me the third slide could by chilodonella am not sure. @NikkiRae