So I'm setting up a 20 long that will be eventually heavy planted and I'm using a fluval c2 hob filter. Was thinking of putting a power head in as well to just increase the flow through the whole tank. Is this a good idea? I don't want anything strong. Is there one out there that is good for this or would my hob have enough flow? And should I have my filter off to the side or in the middle? I've always put them off to the side but have seen a few lately where it's right in the middle.