None, menarambo and kieneri are dramatically different and no hybrids have been documented. Kieneri, however, is known to hybridize with Paretroplus nourissati.
I am not sure what FTS stands for
I used a hydrophone to try to listen to the fish, all I heard was a loud hum from the rerun pump running the wet-dry. I placed a sponge under the pump and suspended the return hose away from the tank.