I've never heard of this fish before. Do you have pic?
I'm not trying to be rude when I ask this but is English your first language? If not that would explain a lot.
Bigger is always better. You need bigger than 29g for what you currenlty have however. I would think a 40-55g is they way to go, and you could even get a few more 'china algie eaters' to harrass your other fish in their later years.