Take the pump to a local HD store and try to find what fits on it, get someone to help and tell them what you are doing, because you may want to use soft tubing so you will need an adapter. Depending on what type of reactor and what you keep in it you will probably need a valve to control the water flow and Iwaki pumps are not bothered by that at all, they are 20 year pump with little to no maintenance, I have a Iwaki Japanese 30 pressure pump for my return on my 120 works great it heats my water in the winter so I need a half the heaters on my tank.
An inline? As in tubing? No I would buy it from you if you do not need it, but I think you should use it.