Help with bare bottom nano tank

[Joeganja]

I’m planning on purchasing a waterbox 20 AIO and moving my 14 year old maroon clownfish in it and did to the fact he stirs up the sand bed I plan on not running any sand so that it will create less of an issue down the road for denitrifying bacteria. He tends to kill any snail and crab I throw in the tank so having a clean up crew is near impossible. Is having live rock and biological media sufficient enough to keep that tank thriving along with the possibility to try to keep some anemones to hopefully try to tend to his temperament. Would I be better off adding sand even though he may disturb it. I’ve been out of the hobby for a while and I’m a bit rough in terms of my knowledge base right now.

 

[Mr. Mojo Rising]

The rock is sufficient for biofiltration, no additional media is needed IMO.