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If you use 2 membrane with the correct 4:1 ratio you should get the same life as using a single membrane if you are still in spec with the manufacturer. Localy I have 125ppm TDS, IF I would use 2 membrane, I would have 150ppm at the second, not very high still and I doutb it would change something.
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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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