I have a 180 gallon that has been bare-bottom since it was set up about a year ago. It's stocked with two oscars and six parrotfish. I've been wanting to add substrate for aesthetics as well as some live plants (these oscars have never been destructive of plastic plants in their previous tanks ::knocks on wood:
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I've seen several beautiful tanks with sand as substrate and was wondering if this would be a good choice for my own. If so, what kind of sand would be best suited for the tank?
Also, the filtration consists of three HOB Bio-Wheel 350's (easiest for my parents to maintain while I'm away at school), one Magnum 350 (set up for mechanical only), and a Fluval 404 for additional biomedia; would the addition of sand to the aquarium potentially damage these filters/how could I help prevent it?

I've seen several beautiful tanks with sand as substrate and was wondering if this would be a good choice for my own. If so, what kind of sand would be best suited for the tank?
Also, the filtration consists of three HOB Bio-Wheel 350's (easiest for my parents to maintain while I'm away at school), one Magnum 350 (set up for mechanical only), and a Fluval 404 for additional biomedia; would the addition of sand to the aquarium potentially damage these filters/how could I help prevent it?