I had read they would do well in groups and they stay fairly small. However, I really wanted Talbots and or Smith's and they are just not available anywhere. I love the azures (kupang) as I have had them before in my 210g and they are very peaceful. We will see how my 4stripes do. I may just add them to my more aggressive tank with clowns and carpets. We will see in qt how it goes.
I have had Blackmouths (as I was told they stay small and after research knew they grew large, but wanted to try them). What a nightmare! They are very aggressive and large! Do not be fooled by the cute juveniles yellow and black stripes.
Time to go see the babies in qt!
Try these instead of the 4 stripe. More expensive but way less aggressive