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So I think the gradual death of shrimp has subsided. I havent lost any for atleast a month now. During the water change today I was even surprised to have found a shrimplet. Tank wise not much has changed since my last post. Ph is still high, and I have yet to restart the tank. Algae bloom still in full force. Sorry for the late response @sdlTBfanUK but yes it is summer here! I've just added some otocinclus' to help with the algae and although I too like the algae at the back, I might remove it the next time I clean it as I've heard its best to remove as much as possible as it could be releasing spores and therefore undoing any manual removal I've done. Of course I'll make an update once I've restarted the tank.

Good to get an update! I would carry on as is with the neon seperate until you are really sure it is ok and not risk putting it with the other fish. I got some new neons before xmas and one seemed to have this but I haven't seen it recently so it either recovered, or died (can't remember how many I bought???). My (albeit limited) experience with neons is they aren't very robus/strongt, but are easy to get, pretty, and very cheap. Taking that into account I would tend to dispose of any sick ones I find, though I only do this with neon tetras. Simon

Hey! Ah sorry, yes I only use remineraliser when I do waterchanges not top ups! All other fish seem fine since qting that particular neon. The neon is still alive (almost a month now since qt) which makes me think it may not be columnaris as I've read that it is fast acting. Its been behaving normally this whole time but the white growth on its nose is still there. This is the treatment I've been conducting since I already had these on hand: I've been using both Melafix and tBroad Spectrum Remedy in minimal amounts as the qt tank is a small breeder box of ~700ml. I used 0.5ml Melafix and 3 drops of BSR. At one point it seemed like the white growth was decreasing in size. It reduced revealing pink/red underneath on its nose. However a couple days later the white growth had regrown. So from what I can tell it seems to be like a cycle. The white growth eventually kind of peels/flakes off revealing the pink/red (wound?) underneath before the white growth reappears. The neon is still alive and behaving normally. Any tips?

Hopefully by removing the sick fish the others may be alright, as mine were. You are doing the right thing and keeping an eye on the remaining fish! I am quite surprised to hear that you are using RO water and remineraliser! If you top up the tank between water changes you should top up with pure RO water, otherwise you will get a build up on the parameters, as evaporated water leaves all the minerals in the tank. Even if you just get a small diameter piece of tubing and let the water syphon in from the bucket will be less disruptive and more gradual? The rock may be affecting the PH, try tesing the PH of the new prepared water before it goes into the tank. If the soil is reducing the PH and fighting the rock then the Ph will rise a lot more when the soil is exhausted, and the soil may get exhausted quite quickly. Simon