i've had an acan for about month and a half to two months. i have 4 54w t5lights. ammonia nitrate and nitrite all at 0. my calcium is around 400. the acan looks nice and healthy i feed them every other day when i feed the fish. no new heads has grown on it and i was wondering if that seems right. are some just slower growers than others? it's nice looking but i don't think it a rare one by any means. my tank has been set up since the beginning of aug so could it just be the tank need more time to mature? any advice is appreciated as always.