as with all fish some vary from the standard. as in some are more actiuve or less active, or more aggressive or less aggresive.
There always seems to be a few fish that just dont go by the book.
Swimming is fine. Our RTC swimms all the time, he only actually beds down in his log a few times.
He wakes up every morning (unlike how he's supposed to be a dark loving almost completely nocturnal cat) and swimms toward the sunlight coming in from the living room window. When our cichlid light comes on he swimms over there and hovers around starting at that light.
I really dont know what to say about your babys mouth neing open. I would say be sure EVERYTHING in the tank is accounted for, rocks, decor. thermometers, suction cups, EVERYTHING. They all are non-descriminate eaters to a point.
Also, when they "outgrow" certain foods (its too small for them to eat) they need to eat larger foods. Since the bloodworms may be too small to be worth the effort for the litttle guy try THAWED frozen beefheart. But be aware the RTC grows fast and a 40g simply wont last long as a home for him (he gets to 6ft in the Amazon)
