Calcium reactor for 300g

[DogueDeBordeaux]

I have a 300g sps tank filling up with frags.
I want to get a calcium reactor, but have limited room. I can fit the RO 140 dual, or the SRO 5000 single. Which would be the better reactor for me? Can the RO reculating pump be upgraded? Since I ATO with kalk stirrer, will the SRO 5000 be best with the stronger pump?
What is the rating in gallons for the RO 140D and the SRO 5000?

 

[cymaster007]

You should also check out the new aquamaxx carx. I have one and it is very easy to maintain and energy efficient w a small footprint.

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[Jeremy@CoralVue]

I would suggest the SRO-CR3000 which should be more than you will ever need for your 300gal. I run it on my 220gal and it has worked flawlessly.