Dwarf Seahorses?

[Liz]

But again about the filter.... is there any non-noisy filter options?

 

[Amphiprion]

Depends. There are a few options, like a small protein skimmer and/or refugium and/or algal turf scrubber, etc.. Obviously, this would be easier if you made a little sump for this (plus it would supply more water volume for stability, while still allowing you do concentrate food in the main tank). It's all depending on what you are willing to do/spend.