What's The Smallest "Monster" You Know Of?

[Ptrick125]

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View attachment 811273
In a 5G tank a couple of these and like a ram cichlid - some plants....= Killer freshwater nano!

Are those fiddler crabs?


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[Fat Homer]

^ looks like it, in which case they need both brackish water and a land area...


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[Gage Zamrzla]

I'm pretty skeptical about it but what does anyone think about a single exodon in a heavily planted tank? If provided enough comfort in the plants, would this be a fair idea? Another note, the Fluval Spec 5g has about a 17.5"x6.5" footprint so it's got a little more back and forward swimming space. This in regard to all species not just an exodon.

 

[gill]

If you want something truly interesting and predatory, have a look at these >> Indostomus paradoxus

 

[giant19000]

Butis butis??
Leopard centepoma srry if spelled it wrong lol


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[Cichlaholics Anonymous]

Perhaps one of the smaller species of mantis shrimp, since everyone is suggesting crustaceans. And they are "mini monsters" based on the OP's definition based on being predatory.

 

[boldtogether]

Melanochromis Auratus, when it changes from female to male. Holy terror.