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CO2 Reactor Choices

Hi everyone,
I am currently injecting CO2 into the intake strainer of an Eheim 2217 in a 
125 gallon planted tank. This method seems to work pretty well, but I'd be 
the first to say it probably is not the most efficient method (anecdotal 
observation). I was thinking of trying an inside or outside tank type reactor 
to see if this was more efficient. I chose canister injection primarily to 
lessen visible equipment inside the tank. I know CO2 is cheap, but would like 
to try a more efficient method. Or am I wrong in thinking that canister 
injection is rather inefficient? Any recommendations for of the shelf 
reactors would be appreciated. In-tank or external is fine. I am going to 
stay away from DIY at this time.
The other Dave G