Oh i see. Umm test strips? i have no idea what those are. Can you lead me to a site to show me what they look like? and what do they check for?
Also, how can i get rid of this nitrate and nitrite?
I have a friend who has a 30 gallon tank. but hes a jerk and tells me to just leave the filter. he keeps in an arowana, 2 dempseys, and a big pleco ( i think it is ). he tells me he just water changes once a mnth and doesnt do much.
He is probably lieing. He says he has a fish that eats up the crap.

but i dont believe him.... thats why im asking here on MFK.