I have a 10g tank I set up about a month ago. I have an amazon sword, wisteria, val and some kind of short grass looking plant. I fertilized the tank heavily when I put it together. The plants are doing really well except it has brown algae I think is caused by diatoms. I have not done any water changes, just topped it off. There are no fish. I'd like to do a water change to get the nitrates lower but if I do I feel like I'm just introducing more diatoms and the algae will get worse. The light is a stingray. Any suggestions?