So..I'm at a standstill with my pond, which is in mid revamping, I've been debating on wether or not I'm in need of a 55 gallon drum biological filter or not since I will be having a bog with plants...i will be having a skimmer with a submersed pump in it that goes up to the waterfall/filter skimmer that spills into the bog than runs down a maybe 5 ft. long trail into the pond..any and all advise would be helpful...and hopefully not costly .. :goodnight: