well we went out for a drive through the bush, and came to a waterfall, there wasn't actually a water fall there, because it hasn't rained in awhile what there was still a pool at the bottom of the "waterfall" full of 100's of frogs and tadpoles, along with small fish, but some of you may like to know it was also full of freshwater shrimp, and the water was super hot, i cant say whether they are the same as the ones we have in NZ, but these ones would defiantly survive your tropical tanks.