mark7616
potatoes
when i bought my tank i was told to change the white part of the filter sponge after 2 weeks which is today but i have nitrite of 0.25ppm and i can shift it i have done 2x 1/3 water changes over the last 3 days and added 3 days worth of amquel do you think i should still change that filter bit and could this help with my problem???