Guys
Out of all my tanks 3 off - 2 previous (no longer have these) and 1 new one (current), I have never ever encounted Diatoms until now. The tanks is 60 ltr (Aqua mode 600) eheim pro 200 external filter, lighting period 6 hrs total wattage 22 watts (aquaone tubes), full E.I ferts, Co2...