What do columbian sharks like in the aquarium?


Hi, I want to make a healthy environment for my columbian sharks I have gravel, I bought some dragon rock but it kept releasing dirt and disintergrating in the brackish water and quiet sharp so I replaced it with a ship before I introduced them to the aquarium and added a different rock for them to hide behind, is that enough? Or do they need natural plants, fake plants, I don’t want to take up too much space as they like to swim but the aquarium doesn’t seem like too natural looking at the moment, also they’re quiet small so I will probably have to remove the ship when they get bigger incase they hurt themselves swimming into it?

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