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The thing about 20% less life is not real, you would need to have a membrane that would have a life of XXX Gallons @ XXX ppm.
Membrane don't work like that, it depend on way too much factor.
Using your logic that would say a guy with TDS of 50 would get 5 years while someone with 200 would get 1.25 years? that's just stupid.
Most membrane will last over 5-7 years if your TDS are below 500 if I remember correctly. If you have a higher TDS, like AZDesertRat, I would use a 50% rejection membrane to reject most of the salt and have better life from the 99% membrane. I think they sell low ratio membrane for that.
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2 ocelaris 1-1.5", 1 bandaii cardinal, 1 yellow watchman goby
1 pep. shrimp, 10 nas, 1 astrea , 1 cerrith snails
Some softys
PH 8.1, Alk 11, NH3/4, NO2, NO3 0, Temp 77-79F, SG 1.025
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