OK. First off, How old is the tank exactly? How soon did you get the clown? These questions I am just wondering for fear of the clown kicking the bucket if the tank wasn't cycled.

Next, the algae your seeing is brown right? These are DIATOMS. I believe that everyone in this hobby asked someone about the brown algae when they started their first tank. I have come to believe that the brown algae is just a given with any new tank. It is just a "thing" that happens to everyone's tank. I am even dealing with an outbreak in my tank that I moved with me to SM.

Once your tank matures some more and the bacteria level gets up to par, the brown stuff will begin to change to green. I am having a problem with it because I only brought about 10 lbs of my old sand and added a new 20lb bag when I moved the tank. That is the only thing I have changed from before and even have more flow than I did. Once your sandbed matures, the algae goes green and you get the fun stuff like Cyano, which is always red, green, or somewhere between blue and purple, or hair algae if you haven't taken care of the problems they are telling you to monitor and change.

Like with anything in this hobby, it will just take time and there is nothing you can do about it except clean every day or two. Asthetically, you can get hermits to stir the sand up and keep it from growing. Personally, I found that leaving it on the glass and stuff helped it go away faster, but thats me. Get your flow going good and keep your lights on for no more than 6 to 7 hours and you may see some improvement.

I'm dealing with this same problem with a friend that lives a couple doors away. Also, when I worked at an LFS, I had people coming in all the time after they just set up their tank and I told them the same thing. I don't remember any of them telling me that it didn't work itself out in a couple of weeks at the most.