I ave 29 g tank, heavly planted, and i have 5 neon black neon and 5 rummy nose, over the last 2 weeks, the black neon will stop eating for few days then it will die, it been happening to one after the other , not to all them at the same time, no other sign of disease to any other fish, even the balck neon, they dont have any sign off sikness other than sopping eating, any suggestion?

How long has the tank been set up and how long have the fish been in it?

hi, its abot 4-5 month old, some of the black neon bee there for 2 month, and some for 3 weeks, both of them starting to die.

I had a similar issue with a school of tanicts in my 6 month 20 gallon tank, and that seemed to be excess of parasites, bacteria and fungi.

My fish had three symptoms. Some of them had hollow bellies even though they were eating daily, some had their tails rotting, and some frequently rubbed themselves against stones and plants (a sign of ich). The ones that had hollow bellies died.

I think that the root cause of this was poor maintanance of my substrate. I had rather not siphon glossostigma judging that this would harm the plant, but that seemed to be a mistake.

On the front corners of the tank, a lot of mulm could be noticed within the substrate.

I performed 60% water change thoroughly siphoning glosso by pressing the siphon on the top of it, throughout the substrate. This procedure removed a lot of mulm and hundreds of a tiny crustacean which species I don't know.

Also let UV turned on for 4 days.

In 2 weeks, fishes are not flashing on stones any longer and their tails are recovering.

Now, siphoning glosso is part of my maintanance routine.

Regards,
Evandro.