As for maintaining, you need to know your CYA amount. If CYA 0, you'll lose FC fast!
otherwise, use the best guess chart to determine what your correct FC is; test FC and pH daily, the rest maybe weekly.
Keep your FC in the range from best guess chart, keep your pH between 7.2 and 7.8...
With your alk, you may notice a rise in pH over time- keep acid on hand to lower it... mine goes up to 7.8, I add 2-3 cups acid and lowers back down about every 3 weeks (will probably be every 2 weeks when it gets warmer! more pump time=more aeration=more pH rise)