I have 6 with 4 ember - been there for 3 or 4 months.
I really like the look of the messy tank. All the colors pop, it’s almost like a natural GloFish(TM) tank
How many Neons do you have in there? For how long have they been in there? I decided to go with Glowlight tetras in my 5.5. Not sure if it will be big enough for them long term, but for now they seem to be thriving.