Ok so there isn't really any "sharks" you can get to live in there for full life so what i recommend is getting some colombian sharks which are catfish that look just like sharks and only get 10" yes it sounds to good to be true because it is they need to have gradually inserted aquarium salt another species I would get would be bala sharks, rainbow sharks, and one iridescent shark which would supply the look and feel of a real "shark" tank and all of those fish except maybe the iridescent shark can live in there their whole lives because iridescent sharks get big and they jump and swim really fast. Here is the stock I would get
6- bala sharks
6- rainbow sharks
3- Colombian sharks
2- plecostomus
1- iridescent shark
Three Colombians is alot so I wouldn't recommend getting that many but rather one
But if your not looking for looks of sharks but rather feeding of sharks then pick up a pair of jack dempseys they are awesome fish and two can live in this 120
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