Do any predatory cats stay small?

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In southeast asia there are many types of small stream catfish (akysidae), I think that all of them are fish eating predators and many are very small, some of the specialize in ambushing and eating juvenile loaches and other catfish. this one is the Akysis hendricksoni from Thailand and barely gets 2" long

Akhen_u0.jpg
 
A lima stays kinda small.....the one i had only got to 12" and never grew any bigger .....
 
actually, lima's can get pretty big, like 2'.


i will be getting ornate chaca chaca catfish.
they don't move much day, or night but when a fish comes by it vaccumes the fish, invertabrate(anything that fits in it's mouth) into it's mouth.
they also like to bury themselves in the gravel.
the color is brown, and they have wide mouths! i like how they look!
but be careful since they can lower the ph, in the aquarium.
 
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