I change out 10 - 25 % a week. Gravel clean a couple of times a month. Change the filter once a month. Check ph/nitrite/nitrate/amonia levels regularly. And well, as I have only had the tank two months, I havent gotten into much more of a routine yet. I don't know what the silicate level is in my water. I dont even know what silicate is

. I will give the plants a good cleaning and see if that helps the problem. As for live plants...good gracious! I am already feeling overwhelmed with fish mantinance...but maybe when I get more comfortable with the fish, I can think about plants

.
Thanks to both of you for the advice.