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You could probably go up to 8 lbs of LR. But you'd want to get that set up earlier than later so you don't need to rearrange aquascape with life in the tank.
Not yet and Im not much for adding chemicals to my water most ppl on here say that with weekly water changes u shouldn't need to supplement they should be getting enough from the water but I'm looking into getting a reef test kit just keep an eye on things