I dont have a sump on my freshwater. I done more research and decided I'm going to go this route.Hi Bedrock
i think you posted this in the Skimmer Q&A thread already. This thread is the data base thread for various types of skimmers so you probably wont get much of a reply but I'll try. HOB is the best option! You will have nightmares trying to run an external and plumb it (feed pump flows/check valves/potential for flooding etc..)
why no sump? you can get a small compact somatic sump or eshopps for cheap that can fit under most all tanks.