Hello Josh and Bernd , I have quite different expirience in that mater … I had very often an open aquariums with a paro and nothing happend until … When I came back from our first international meeting in Hamburg I received 3 beautifull adult pairs of P. quindencim . I wasn’t prepared for them , and I didn’t have any aquarium. I decided to leave all fish in a styrobox container ( about 5L ) to next day . I put “old” spongy filter inside and went to sleep. Next morning everything was ok. But when I got home from my work – disaster .. All 6 fishes jumped out from the container ! All were dry and dead .. It was dramatic …
From this time I cover all my paros aquariums. It seems that paros do not jump out from the correct conditions aquariums – but be careful when they are in a temporary containers ..!