Mixing predatory fish with tankmates too small to eat

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MultipleTankSyndrome

Giant Snakehead
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Sep 25, 2021
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Loachaholica
The discussions in these threads got me thinking hard about this concept.


An example: Most of us know that pictus catfish love to eat neon tetras (so much so that Wikipedia even brings it up), and you can't have the 2 species together without the neons eventually becoming lunch.
However, replace the pictus catfish with one of its tankbuster relatives (like a red tail catfish), and you'd find that the red tail catfish leaves the neons alone. They're just too small to be worth the trouble of chasing down, catching, and eating, unlike something the size of, say, an oscar (which multiple cases exist of them being eaten by red tail catfish).

Who is mixing large predators with small schooling fish in the same vein as mixing arowanas or red tail catfish with neons, like outlined in the links and above?
 
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Here's an old thread with a 22" Aimara and 400 neons

 
I love setups like these... although in my tanks its usually a fry cloud:mwave:

but it makes sense, the little nutrients aren't worth the effort.

M MultipleTankSyndrome I think you would greatly enjoy reading about the natural symbiosis between three species of cichlid found in Lake Nicaragua; Parachromis Dovii, Hypsophrys nicaraguensis & Neetroplus nematopus.They play different roles to each others survival at different stages of their lives
 
The New York Aquarium had an arowana in a tank with harlequin rasporas over 15yrs ago. It was fun to watch the school skim along the bottom of the tank switching which end it was at as the aro swam back and forth at the surface.
 
Apparently Ripley's Aquarium had this sort of thing with an electric eel and rummynose tetras. Shocking ?
 
Can anyone make out what the fish is that moves from the top right down to the substrate between :10-:15 seconds
 
I have done this before. A large well fed oscar with black skirt tetras and I agree it is pretty cool.
 
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