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Hi I have an issue with my old tank, which has over 2 years right now and the issue is NO3. Currently I am forced to do 25-30% water changes twice a week, and this is just enough to keep the NO3 below 10. The tank is 30L (8 gal), inert substrate, heavily planted, I add no fertilizers. Two HOB filters - one is sponge, the other one is small sponge + peat + JBL nitratex. For water changes I use salty shrimp GH +, Azoo Triple Black Water, Azoo Mineral Plus(every second week) and Azoo Ph Down, to adjust the pH of the water that goes into the tank with what's already there. As for bacteria I add seachem pristine, and seachem stability once a week around 2ml of each. Feeding is once per 2-3 days, small amounts that gets eaten in a few hours. So I had that issue already around 5 months back and what I did is bought the JBL bionitratex and added duckweed, and it did solved the problem but to get a good result I had to use two bags for a single tank (the product comes with 4 bags total). Now this thing is quiet expensive imo for the time it lasts, so I would like to ask for any other options to keep the NO3 in check, as the plants are clearly not able to handle that. From my observations - there is a substantial amount of muck in the substrate, but since the tank is heavily planted I cannot vacuum it. Quick pic of the tank below. Your help greatly appreciated !