Both great suggestions. Think I kept vaterfloris many years ago.Espie are just as easy to find as the standard Harlequin
Boras Brigittae are very small and can be tricky to feed as you need really small foods
One of my favourite at the moment are
Rasboroides vaterifloris Fire Rasbora
And if you want a nice tetra look out for these Green Fire tetra aphyocharax rathbuni
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The rathbuni look great, are they as nippy as other aphyocharax species?