First off, I should say that Elephant nose doesn't like to be a solitary fish; they prefer to be in groups of at east 4 or 5.
That being said, have you thought about keeping both tanks, and leaving your tetras and angel in the 29g? The Elephant nose may be happier that way, and won't have to compete.
150g long S Amer cichlid; 90g C Amer cichlid; 90g Malawi cichlid; 40g Tanganyika cichlid; 29g "Shellie" cichlid; 29g Pea Puffer. 6,500g koi/native catfish pond; several smaller ponds