The hoses won't fit exactly, I just clamp the larger hose of the filter down onto the reactor barbs with some good screw type metal hose clamps. If the hose gives you a hard time stick it in some hot water to soften the end a little, then you'll be able to work with it.
Filter ratings are based on an empty canister with no media. Chances are the filter output will be far less in the real world, with media ,hose bends and barbs slowing the flow rate.
The reactor 1000 is probably the best reactor you can get. I got one on my 75. Sometimes I forget it's there because it's completely maintenance free.