Hi, after a weird accident i had ive decided to talk about it.
this hapened in 29gal tank, wich is high tech, has external filter with roughly 1 liter ceramic and 1 liter sponge filtration. and a cheap prefilter on input tube. PH=~6.5, TDS=~200ppm, CO2 drops PH by roughly 1 unit so its ~30ppm. tank is understocked(6 tetras, 1 BN pleco, 2 otto) with light feeding.
I changed the prefilter, cleaned the filter tubes and rinsed the filter in tap water without touching or even opening it. After few days i was able to measure small amounts of nitrites. with the same test kit nitrites are 0 in other tank, so blaming on test is pointless here. nitrites remains measurable for 3 days now.
so now im thining.. what did remove or kill Nitrobacter bacteria, wich is responsible for No2-->No3 convertion?
Could it really be that those dirty tubes and pathetic prefilter contained more bacteria than fancy external filter with high volume of ceramics and sponges?
Could it be rinsing filter in tap water wich has different PH and temperature killed it?
Could it be my tap contains some alien chemical particles that hurts the bacteria?
none of this makes sense according to http://www.bioconlabs.com/nitribactfacts.html
anyone has any thoughts on the subject?