| Sounds as though you have a fish that just is not destined to grow. Possibilities are: (1) genetic; (2) being out-competed for food by other tank inhabitants; (3) is an old, stunted fish. [Maybe more possibilities?] If it is #2, then you can alter the situation by changing the care your provide, although there could be a deformity that causes the fish to lose out in the competition. If it is #3, then the fish would likely have had a very finished appearance at the time acquired, and a head shape more like an adult. |