on my 125 I use an overflow/sump on one end- the sump holds all of my heaters and has a really heavy duty pump to power the water through my Co2 reactor and UV. That's another good thing about a sump- you can get a really high flow pump to compensate for the drag all of the inline equipment would cause for a lot less money than a canister filter capable of moving the same GPH. I have an adjustable 1200 GPH pump in my sump. I have an eheim classic on the other end. I have an eheim pro with the heater inside on another tank, but don't think its worth it if you have the room for a sump instead. Also, if one of the heaters in your sump goes, its easy to replace it.
Just one thing I can not recommend highly enough- get quick disconnects for your hoses - for both ends of each piece of equipment. That way if you ever have to remove any one piece of the puzzle its a snap. They are a lifesaver.
Just one thing I can not recommend highly enough- get quick disconnects for your hoses - for both ends of each piece of equipment. That way if you ever have to remove any one piece of the puzzle its a snap. They are a lifesaver.