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Yes, of course you can add plants later.
I wouldnt go for 2 WPG unless you want to get into a planted tank because you might end up with algae problems unless you start dosing ferts and then getting towards 2.5 WPG you need to think about injecting CO2.
Some low light plants to look out for: java fern, java moss and anubias (all attached to wood/rock). You may have success with other plants...crypts, hygrophila, maybe swords...