I had a Jack Dempsey in a tank in my bedroom that was very similar. Before the fish died after having him for 8 months, he would still hide just about all the time. My next fish (a Chocolate cichlid) was completely opposite to start, but started hiding once I rearranged the tank and made a new cave.
In your case, I think I would remove some of the cover temporarily (or place it to where they cannot get behind it). You do want to leave them with some cover, but cut back what you have and let them develop a safe feeling of being out in the open first. Then try and put stuff back to where you feel it looks best in the tank. If they go back to hiding a lot again, try moving the cover around to different spots and maybe make one of the safe spots exposed to the front glass (like a piece of driftwood leaned against the front glass, creating a safe-zone exposed to the front).
I hope it works out for you, you have some nice stock picked for the tank. I think you will find CA/SA cichlids 10x better than African cichlids as well. The personality differences are vast, the CA/SA cichlids are much more personable. I am glad to see you have a Oscar, too, they tend to have the best personality of CA/SA cichlids (gentle giants). Assuming all your stock gets to full size, you will have a large bio-load in there as well. You will be doing a lot of water changes to keep your nitrates down, just a heads up.
In your case, I think I would remove some of the cover temporarily (or place it to where they cannot get behind it). You do want to leave them with some cover, but cut back what you have and let them develop a safe feeling of being out in the open first. Then try and put stuff back to where you feel it looks best in the tank. If they go back to hiding a lot again, try moving the cover around to different spots and maybe make one of the safe spots exposed to the front glass (like a piece of driftwood leaned against the front glass, creating a safe-zone exposed to the front).
I hope it works out for you, you have some nice stock picked for the tank. I think you will find CA/SA cichlids 10x better than African cichlids as well. The personality differences are vast, the CA/SA cichlids are much more personable. I am glad to see you have a Oscar, too, they tend to have the best personality of CA/SA cichlids (gentle giants). Assuming all your stock gets to full size, you will have a large bio-load in there as well. You will be doing a lot of water changes to keep your nitrates down, just a heads up.