Hi All: New here. Have been lurking. I would appreciate your thoughts comparing fluid bed filters vs shower filters.

It seems like fluid bed filters require water to come in under pressure (as opposed to gravity), but are smaller compared to shower filters.

Shower filters seem to be able to be gravity fed or pressure fed, and tend to be tall/big.

What other pros and cons are there? Which do you prefer, and why?

Is there a rule of thumb for amount of media per gallon of water, or number of fish, or??? (Saying bigger is better is not that helpful.)

Many thanks in advance!