Ok i think i found my nitrate problem. My sand in DT is hard. I can break it up with effort. I think its trapping gasses. The tank has been set up for over a year since ive had it. I bought tank stand canopy and sand from someone that had it set up for 2 years. I dont dose anything but original owner did. Im thinking about taking old sand out and replacing or going BB. Another option is cuc. Is there anything good that can break up sand?

