Hmmm maybe Chocolate Gourami? They get to about 1.5-1.75 inches. Still too big for a 30l tank though lol. IIRC Chocolate Gourami are one of the smaller gourami species. Actually nvm, I believe Licorice Gourami's are smaller. I think they get to 1" in length. @AnnH2 Did they have black/white stripes?