[David]

Casey, U gibba traps are too tiny to capture mosquito larvae. Perhaps you could try U. aurea that has a much bigger trap. But then again, looking at the traps, perhaps it si still too small to swallow the mosquito larvae. Perhaps get the Utric species with traps that are about 1 inch in diameter... sorry, can't remember that species name. It's not found in Malaysia. However, that aquatic species has the largest traps.

Thanks Arvin for your tips. Very useful information.