I had a recent experience with abnornal low nitrate readings on my 125 growout tank and was wondering if anyone else had this happen. I work 7 days and I am home for 7 so I always do a 50 percent water change the day I get home and the day I leave, before I did a water change last week I noticed my nitrates were maybe .5 , I even tested 3 times . They are always .20 or higher after my week of work. My ammonia and nitrates were 0 like usual. While doing the waterchange I noticed my fx5 flow was reduced to a trickle from a clogged water polish pad. I run a water polish pad and packed the other trays full of seachem matrix. I also have a xp4, ac
110 and emporer 400 on this tank that were working fine. Could the reduced nitrates be due to such a slow flow in my FX5 and anerobic bacteria in the matrix using up the nitrates?