Ca too high -- what do i do ?

After doing a 50% water change on a 135gal I added calcium to my tank

* CaCO3

* experimented by dissolving it with H2O2 over a 3 day period on a mason jar while letting the sediment settle on bottom and pouring out the water and filling up to top of mason jar (20oz) each of the 3 days.

I added a little bit to both rear overflows after doing the 50% water change and tested Ca about 3hrs later.

!! the Ca level is somewhere above 2000 ppm !!

what is the best course of action in this situation to bring levels back to 20-60ppm?

Freshwater tank
. SAE
. loach (khuli,java,)
. lemon tetra
. emperor tetra
. ember tetra
. blue tetra

live plants
. Crypts
. rotala rotundifolia
. glosso
. pogostemon stellata
. jungle val