Has anyone set up a planted tank using kitty litter/capping it with sand? Does it have to be atleast 75% planted?
plain, cheap, unscented, clay Kitty litter provides next to nothing, but it has a high CEC. CEC is too hard former to explain in one post, but essentially its the ability to absorb excess nutrients and release them over time.
CEC is good, but a mixture of soil and crushed vermiculite is better. (4 parts sifted clay-rich soil, 1 part vermiculite, moistened, and kneaded together) has the same benefits. just cap with sand. there's another thread below this one that covers soil.