hey guys, new to the forum, not to the hopbby though, ive had my 20 gal for a while and i recently changed substrate from reg gravel to silica sand because i heard my senegalus bichir could ingest in and die. This tank has always been planted but i cant get it to balanace out and take off, i inject co2, 2 24" flor(40 watts) chroma 50 5000k bulbs, started using ro water recently and buffering it with tap (i think there is lots of phosphates in tap water)(phoenix, az). anyway, i want to add some flourite or laterite to my sand. first, what should i use, flourite or laterite? second, how should i do it, just wash the laterite and mix it in with the sand? or should i remove the sand, and put the laterite down first then cover it with sand? need answer asap if possible. thanx guys.