2.7 Gallon Pico

[Beano1169]

Hey all I have just started a 2.7 gallon pico tank, 1.5 lbs of LR an Aquaclear 30 and the fluval spec lighting system is on it. It has been 2 days and I have noticed no ammonia or nitrite, the concern to me is the possiblity of low PH currently Im sitting at 7.8-8.0 using the API saltwater master, as well as a boom in Nitrate about 5-10ppm. In a tank this size should i be doing water changes daily weekly bi-daily?? how can I fix the nitrate issue?

thanks for your help
-Jayden