I was able to get some Pyrrhulina cf. brevis. I am having a little bit of a hard time finding any info on them. I am wanting to use them as dithers for my breeding pair of A. Agassizii. Would Pyrrhulina cf. brevis make suitable dithers / tank mates with 1 pair of A. Agassizii in a 20L? I do not want to put them in if they fry eating piranha. I purchased 10 of them and am planning on putting them all in together. I am not sure if that is a good number or not. If that is too many I can seperate them out in other tanks if need be. If anyone has any other info or suggestions please let me know, thanks.