When will a male synspillum develop a sizable hump. Mine is 3 year old and 11" long, but only has a slope on the forehead, but not much a hump as I saw in other pics and youtube. I think it is a male by his head profile and examination of his vent. Could it be the environment that delayed his hump formation as I raised him as a lone male with no other Vieja competition until recently. I recently got him another 3" sysnpillum and a couple V. fenestratus as tankmates and wonder if it will induce him to develop the hump or not.
