I've got a 24 gallon biocube and have a male clown that 30 - 60 days will jump from the front of the tank into the back filter section. There is maybe a half inch, at MOST, gap at the top for him to get through. The funny thing is that when I relieze that he's back there, I can just put my hand back there, and he'll swim into it and let me put him back into the tank section. (Tried with a net and he doesn't cooperate)
On a freshwater note. I have lost an arrowanna and my brother has lost one. We found his in the den at least 30 feet away. (was about foot and a half long.) Sometimes they have incredible skills fitting through some of the smallest gaps in a tank.
On a freshwater note. I have lost an arrowanna and my brother has lost one. We found his in the den at least 30 feet away. (was about foot and a half long.) Sometimes they have incredible skills fitting through some of the smallest gaps in a tank.