I'm new to the saltwater side and even though I've read how hard it is to start with a nano and to always go bigger, I'm up for the challenge of a 5g pico. The tanks been setup for about a week and has one piece of live rock, about 2 lbs. So now here comes the question: I've read conflicting information on HOB filters, like the ones that come with small kits. Some say that it's useless and may even cause nitrate problems, some say it's beneficial In a small tank. So, would you say that with a HOB filter, less rock would be required or is it wise to get rid of the filter, buy a powerhead (planning on doing that anyway) and get more rock?