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My tank is just in the first week of cycling but decided today to test calcium and KH
my readings are calcium 280 ( way to low)
KH is 13 dkh
these readings are not good what can I do about it
Nothing a couple of pwc won't take care of. Your parameters are going to be out of whack during the cycle anyways and other then nh3/no2/no3 I wouldn't bother testing for anything else until it's over and you have done enough pwc to get your no3 to 10 ppm or lower. Tanks going to take at least a couple of months after the cycle before everything balances out.
do not worry about any readings until your cycle is complete. The water chemistry will change dramatically from day to day until the tank is cycled. At that time, do a large water change and things will level out.