I recently started a 40g(48x18x12) (have a frag rack on one side and rockwork on the other) and am looking into getting a tang, I have a yellow watchman goby and lawnmower blenny in quarantine to go in soon once it is fully cycled and not much else will be added. Does anybody know how long a small Kole or Tomini possibly stay small enough in it until I upgrade/get another tank or move it to my siblings 90? I look for permanent fish mostly but this would be an exception if it would stay long enough. Any insight is appreciated.