Coral also increases your GH (hardness). It takes time for both (pH and GH) to go up, but it will be measurable. In the interest of stable parameters, I would suggest avoiding it. If you don't mind the parameters moving between water changes (which will probably happen in a nano anyway), then leave it in.
72g bowfront planted, CO2, 4x - T5HO, Eheim 2213 and 2217, 2 angels, pristella tetras, blue tetras, betta, albino bristlenose pleco, albino cories. Sword, vals, hygros, ludwigias, java moss and fern, anubias
2g Mac-quarium. Clown gravel, fluorescent plastic plants, and 2 guppies.