I have the Digi growing in lower light (150-175 par). I run 3 XR 15 gen 4 pros and two actinic light bars on a 60-gallon. Flow is 2 mp40s and 1 mp 10. Nitrates are 5-10, and Po4 is .03-.08. Alk 8.5, Ca 475, Mg 1450
You may want slowly pump your Alk up. 7 is on the lower end and doesn't give...