Niki_up

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Maybe start with a color you like...joke..

But seriously it’s hard for anyone to make suggestions just based on tank size.

Maybe include things like, your tap water parameters, fish you might like, community aggressive fish or a single aggressive fish? Your planned water change schedule (maybe you can only commit to one water change a week and if that were the case then people would suggest under stocking for a lower bio-load vs over stocking which would or could require multiple water changes a week).
 
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Gourami Swami

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Agreen need more info. In a 100 gallon your options for an aggressive tank will probably be either a single large aggressive fish, or many smaller aggressive fish. Which would you prefer?
 

Backfromthedead

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my suggestion is amphilophus of some kind. there are quite a variety to choose from but all get around a foot long and are all usually hyperaggresive. gonnq be a single specimen tank though.
 
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