Nano Filtration Advice

[Bryan_k47]

Hi
I have a 5 gallon Chi
Only have one damsel in it
A 6-7 lb piece of live rock covered in Zoa Frags
Half dozen snails and hermits
No sand but I have dead coral spread on the bottom for zoas to grow on to

Was wondering what you Nano/Pico pros would recommend for filtration on the tank
Right now I have a Eheim HOB with a bag of Carbon in it and the Eheim filter that is used for the HOB
Used to running a larger tank with sump, this is all new to me.

Thanks
Bryan