Last week I picked up the above stated fish for my empty 20 gal. The tank is well established with about 20 lbs of good pukani lr and a crushed coral fine sand mix sb. The 2 have been getting along quite well and look to be a great combo for a small tank such as this. The dotty is quite a character and just never stops looking around and excavating his lair one pebble at a time. The cherub is what I expected and is very engaging with no aggression. I may add another fish or 2 to this tanks,something like a clown goby or 2. Definetly will get a fire shrimp and a few other ornamental cuc. The tank used to have a mantis but it died of old age and it was a shame to let an established tank go to waste.