Additives in the aquarium

[DEAD_BY_DAWN]

a friend gives me the ro water from his system ,ive no idea what model he is useing though but next time i see him i will ask,i think the diatoms might be useing the silicate from a few pinches of silica sand that was attached to a piece of lr but thats only a guess,i havent tested for it,the prizm has been up and running from the start of the tank,i started useing ro water two months ago i dont know if there is still silicate left over i used keny posphate sponge for a short time a few months ago to.