What fish in aquarium can breed on their own without our intervention?

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Pyluper

Feeder Fish
MFK Member
Nov 3, 2025
56
12
8
20
Thailand
I know this isn't about monster fish, but what fish can breed by themselves without our help? Regarding the size. By this I meant no heater, no nothing, just only great filtration, large enough space and decorate the tank enough that the fish are comfortable.

I know there will be convict cichlids, guppies, endlers, mollies, platies, mbuna, kribs and other than that?
 
You live in Thailand, so I will asume you don't really need any heater anyways. Given good water, food and sufficient space and decoration, I will guess nearly every tropical fish that doesn't migrate, like RTCs, or is highly specific will breed if their tank mimics their natural habitat.
 
Not really a monster, but goldfish will breed readily in many tanks.
 
If you want to try to breed tetras, Lemon tetras are a great beginners choice, give them a dark place with lots of cover, and soft water and you will have many minis in no time.
 
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