I have a tub full of them.. I started with 2 males that i purchased and they had already been converted to salt.. Then I purchased 3 females ,and converted to salt . Since that time (approximately 3 months ago ), they have produced babies twice.. The first clutch was 16, and the most recent so far (I first noticed them yesterday) was 5,but my dumb damsel ate them .. So honestly, there may have been more this time also..
But mine never picked up ich, none of them including the babies.. Which the babies to grow pretty fast (at least compared to Bangai cardinals).. They are cool little filler fish in a tub or a look down type of setup/environment..
And I feed mine spirulina20, or nori.. But they simply go nuts over and grow the best it seems on the 20.. I also noticed today, a few trying to tackle a seaweed extreme 1mm pellet..