with your stock list that pump wont be enough. on the 55 gallon drum issue, build a stand so the edge of it hangs over the pond, and cut a slit in it. fill it with media and pump you water in the top. cut the slit about half way up the side, if the water level rises above the slit make it bigger. fill it up with media to just below the slit. go to your local bait shop and ask them to save all old line for you. they take old line off of peoples reels and spool new on. makes a great bio media, and its free. plus it will stay below the level of the water, but not all settle to the bottom so the water will flow around it all. use some sort of filtration pre pump for mechanical that you can rinse out. i use a bucket with holes drilled in the side drop the pump in, then have net bags full of netting that i shove down into the bucket around the pump. you are going to want around a 1200 gph atleast. fill it with feeders (30-40) for a month and your filter should cycle in time to put your fish in. do a large water change and add your fish. the feeders should help your fish accomodate to there new home quite well. if you were to dig a hole and sink that tub where only a couple inches stuck out it would help to keep the heat stable and keep it from freezing over in the winter.