Help! High nitrates

I have recently set up a new dirted tank using earthworm castings. The tank has been cycled but I having issues with high nitrates. There are no fish in the tank. Just plants and some snails. I'm wondering if the earthworm castings are leaving something into the water column. Any suggestions are welcome.
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  • Zachary Kittle

    The tank is pretty stalked with plants and plants are growing great. Nitartes are at about 40ppm
  • Zachary Kittle

    How do I go to to chat?
  • MIMI

    If you're on a phone you need to go to "desktop view" and u can go to the home page from there and choose chat. On a laptop u can see the chat option on the page header.