I am relatively new in keeping Vieja species. I had a 3 year old synspillum male that hits 12 inch, 1 year male fenestratus at 9 inch, 9 month pink fenestraus at 7 inch, 9 month bifas at 6 inch, and a 9 month melanuras at 4.5 inch. The slowest growing Veija is the melanuras as it started out the same size as the bifas, but grew 1/3 slower or smaller. I haven't seen too many full grown Vieja species in LFSs except for Black Belt and Synspillum, and want to know the ultimate size of each species. I've seen a few Black Belt that passed 15 inch, but never seen a synspillum that passed 12 inch, including my 3 year old male.