Need help identifying my Snakehead!

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thanks for the help guys! Uh actually my fish seems to be really unaggressive so i think my current tank is too small :( also, is this species the same as Channa marulioides?
 
thanks for the help guys! Uh actually my fish seems to be really unaggressive so i think my current tank is too small :( also, is this species the same as Channa marulioides?

Marulius and Marulioides are part of the same species complex, but Marulius can grow to nearly twice the size!
And they are MUCH more nasty.
 
Marulius and Marulioides are part of the same species complex, but Marulius can grow to nearly twice the size!
And they are MUCH more nasty.
But then maybe my fish is under stress? I know it eats but I never get to see it eat. It seems to be rather shy in fact. Maybe because my tank is too small. How big should my tank be?
 
But then maybe my fish is under stress? I know it eats but I never get to see it eat. It seems to be rather shy in fact. Maybe because my tank is too small. How big should my tank be?

Correction. This is the question you should be asking: How big should my POND be?
 
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