Freshwater Eel and Freshwater Lionfish
Freshwater eels are another species that seems out of place in a tropical tank. Some of these species are small and snake-like, while others, like the freshwater moray, seem to have come straight from the coral reef.
Freshwater lionfish (slao called stonefish) are predatory fish that resemble their saltwater cousins in habit as well as appearance. They use their unique physical traits as camouflage, sitting motionless, like a rock, until feeder fish (or misplaced tank-mates) swim close enough to eat.
(source:google/http://webecoist.momtastic.com/)
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