Yeah, I'd turf the HOB skimmer and the XP canister filter. Sell them.
Get your tank drilled if you can, or maybe use on of those overflow box like I have to bring water into your sump. Oh, and get yourself a sump. 30 gallons and up. Bigger the better. Get a good sized skimmer.
You have any of the live rocks left??
You may have to be extra stingy with feeding your fish right now... less food, less poop, less fouling while in their temporary home.
Keep a power head going in the drum, and a heater set at 76. Lower temps may help with the oxygen levels of the drum, which does not have a very good ratio for gas exchange. Throw an air stone and air pump in there, too, if you can beg or borrow one. The turbulence that the bubbles create can help gas exchange in a crowded situation.
When you have the names of the fish, and how many, post here ASAP so we can see whether you may need to split the fish up into another drum or clean garbage can.
Do a water change, you may have enough fouling in those drums by now.
Good luck. Hope you find an experience Buddy to help you transition into this in a smoother way.
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