prey

Hey guys, Arapaima speculation question for anyone, Do you think an outdoor fish predator such a Blue Heron could/would prey on a decent sized outdoor Arapaima? I ask because Arapaima are supposedly 'armored' from predators and are known to eat birds but I am not sure how this would contend...

Hello All, I recently put a 6-8 inch Fire Eel in my 125g community tank. Most of the fish in there are large enough to not be threatened by the Fire Eel, even when it's full grown. However I would like to also keep a school of cardinal and lemon tetras (both species will max out at 2 inches)...

So I have long been intrigued by Polypterus species. But when it is generally tankmates that make me cautious about them. Most places I see, say as long as it cannot fit in the mouth, but without knowing how big the mouth is that is not particularly useful. Sometimes though, they will take on...