I recently have to manage a skittish synspillum which is as shy as,JD. I bought him about a month ago and placed him in a tank of growouts to acclimate him. He is the largest fish in the tank, so I thought that it would give him a good start as he is safe from bully. Wrong! He was not afraid of his tankmates but me and wouldn't come out until I stayed away. I thought his shyness would soon go away. Wrong! He remained shy after a week with no sign of calming down. So I made a bold move to put him in my 125 gal community cichlid tank with rough tankmates. He was immediately challenged and had to hide from his new tankmates. He was so distracted by his rough tankmates that he had time to feel shy. After about a week, the pecking order has settled down and he came out more and more. Today, he is the fish right in the front of the tank begging for food from me when I come near. So a change in environment can drastically change a fish behavior.