Pictures of the 2 tanks? I am thinking along the lines of copying whatever (specially decor) is in the 29G into the larger tank. The paratilapia feels more secure in the 29G, that should be the case. You can also check for current, internal and ambient noise, lighting differences and water parameters. Also for dithers, I am thinking of those he cannot catch and kill very fast. Establish the dithers first so they know where to hide and are oriented in the tank (hiding spots) when the paratilapia is introduced. How big is the paratilapia anyway? Hope the best for your polleni.
