For some reason I cannot get my nitrate to go down, I do water changes every other day about a quarter of a gallon. Also have no live rocks in this tank, maybe that could be the reason why... not sure but my nitrate stays around 20-25. I have siporax that I just put in a few days ago, needs to be cycled more. Everything else seems fine in my tank, only been running it for 2 1/2 months. Any suggestions on how I can bring down my nitrate and keep it down??

