It's fine that your nitrate is dipping down to 0 ppm after a water change, but I'd double check those numbers. If it's 20 ppm beforehand a simple 25% change will leave you with 15 ppm. It's directly related to the % water you replace.
The CPDs look a lot better though!
The CPDs look a lot better though!
Carbon wont remove NO3, and usually planted tanks have less because plants use up nitrate.My nitrates in my planted shrimp tanks have always been between 15 and 20, and they've never been healthier. If I'm not mistaken, tanks that either aren't planted or that you run carbon in your filters with have lower nitrates? I never run carbon in my filters so I'm not positive.
that cpd is looking like he's colored up a bit tho! Love the shrimp haha