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Thanks Simon, I've spent way too much time trawling through the old posts in the last few days but will be sure to share the journey of my new (newish... 2 months old now) tank soon.

G'day all, I seem to be having a unlucky streak these past few days. Today I noticed one of my neon tetras in my 15 gallon planted tank was hanging out by himself and on a closer look I saw it has a small white growth on its mouth, kind of making it look like it has a flat nose. A quick google suggests its likely to be cottonmouth or columnaris. Having heard all the horror stories about columnaris decimating tanks, I immediately moved this neon to my CPD tank's empty hang-on breeder box (I stopped the air pump to cut it off from the main tank). I didn't think to acclimate the neon to its qt home, so I hope it will be ok. Anyways how do I go about treating this neon as well as the entire 15 gallon tank? Here is the stocking: 1 Betta 2 Panda Cory 9 Neons ~20 cherry shrimp. Last week I lost a Panda cory out of the blue, now I'm thinking perhaps it is something to do with this potential columnaris? Water parameters: Am - 0 N02 - 0 N02 - <5 Ph - 7.8 KH - 4/5 GH - 8/9 TDS - 208 Temp - 26 I do 30% water change once a week. These parameters were measured just before a scheduled water change, so things like TDS would usually be lower (I try to keep it around 140). I can't seem to spot any other symptoms on any of the other fish. My main priority is to protect my betta! This is my first time dealing with something like this. Any tips on medication and treatments would be appreciated! I'll attach a picture of the neon just to confirm that it is in fact cottonmouth/columnaris.