Water Parameters?

[EdsonFOWLR]

Well I think I finally got my water parameters under control and going in the right direction. I am doing a FOWLR tank, but want to add a few inverts for a clean up crew, as well as my tank is cycling but I think it is almost done. What I am asking is based on the following readings do you think my tank is or almost is cycled out and what can/should I change. Here go's: Temp:80F, PH: 8.0-8.1, Nitrates 5, Nitrites 0.3, Salinity 1.024, Phosphate 0, Ammonia 0, Calcium 500+, Alkalinity 140?. Also should I use activated carbon in my sump or not bother?