I've never used this type of reactor, but I think all in-tank reactors benifit from being as deep under water as possible so that the CO2 has maximum time to be diffused into the water. I would still keep it on the same side of your tank as the spraybar, but at the bottom of the tank rather than close to the surface.
I've read others post that the efficiency of the membrane reactors weren't great so you may want to try something else...either a powered in-tank model or an external one in-line with the output from your Eheim.
The membrane diffuser, not reactor, is actually not very good. You would be much better off with a DIY in-line reactor. I have built several and they work like a champ.
No problem man....the terminology we throw around here can get confusing. A diffuser allows CO2 to passively enter the water column...that is you're counting on small bubbles made by the diffuser to never make it to the surface of the tank where the gas can escape. A reactor actively forces the gas and water to mix, allowing more gas to enter the water column without being outgassed at the surface. Basically, passive diffusion versus active diffusion. That's why a lot of people use inline reactors with their canister filters or run the co2 into their HOB intake...that way the gas is actively diffused into the water. I hope this doesn't sound even more confusing.
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