Im not a chromis guy. Well at least not anymore. I tried 2 groups of 3 chromis at 2 different times. Both times, 2 of the 3 would die off from being harrassed by the strongest chromis and the strongest ones lived. The 2 that i had left never schooled together. The bigger always chased the smaller one around. Maybe a 29G isn't big enough for them to school :/
In that 29G, i would get a royal gramma, a sixline, a randall's goby, a flame and maybe a neon goby