Once the dels get comfortable they'll be out. Mine are out most of the time or they try to bury themselves in the sand. But its obvious where they are, usually only cover their heads. lol
Great that he's activeWas looking at my polys today and was looking at the one Del that I could see had grown about 1/3rd in size since I got him and started to feel comfortable in my tank and swimming around a lot.
I just saw someone in my area looking to sell a fire eel (13" long), are they able to go with them or well it pick on the polys or the bgk I have? I know with the size difference he would probably eat them but I would keep it in a different tank till the others grew more.