For a cheap canister you cant beat the CFS500 killer filter for the money.
For the 55 a 10 gallon would be okay but not ideal. Youll have a heck of a time getting all the media you want stuffed in that small of a footprint. although if you found some stackable containers to run a wet dry type filter its work nicely. You could also drill the side of the 10 and put the pump outside the sump for even more room.
For the 55 a 10 gallon would be okay but not ideal. Youll have a heck of a time getting all the media you want stuffed in that small of a footprint. although if you found some stackable containers to run a wet dry type filter its work nicely. You could also drill the side of the 10 and put the pump outside the sump for even more room.