Datnioides undecimradiatus questions

I got a gold tiger fish as my very first datnioides. This is my first Dat so I read the limited info that I could before I got it but now have some more questions.

The Dat is currently extremely shy and will not come out at all. It hides in a piece of drift wood all day and night. The tank is a 220g with a large sump and several south american cichlids. They are nothing aggressive (chocolate, severum, uaru, and oscar) and they have shown zero aggression toward the dat. It just refuses to come out. It has also refused to eat anything so I broke down and gave it some feeders out of fear of it starving to death. I did not want this expensive fish to starve even though I really want it to start eating frozen krill or shrimp. It did however quickly devour any feeder that went anywhere near it's drift wood.

What should I do? I have a 45g I can setup and keep it alone in to try to get it to eat. The current fish in the 220g quickly devour all food I put in there and the dat just won't come out to eat any of it. Are there any other foods that I should try. I have tried krill, pellets, flakes, bloodworms, brine shrimp, and plankton.

Any advice would be appreciated.

Thanks,
J.D.

There is a mix of all sizes ranging from 4 inches (the Dat and 2 young severums) up to 13 inches. I assume the Dat is wild caught and is just not used to tank life yet. Are most Dats wild caught? Will it get less shy as it grows and gets older?

Thanks for the advice everyone. I think I'm going to give it another week and see if it will start eating. If not I'll setup the 45g and start working on getting him on frozen food with some sort of trainer fish in there with the dat.

As for the oscar it is full grown (13 inches) and in completely non aggressive toward tankmates. So don't expect it to be a problem but it can be moved on down the road if need be.

Thanks again,
jgentry