I went ahead and added second filter since Petsmart has a sale on right now. I went with a Marina s20, because I needed something smaller. I have a marineland (I think biowheel) that came with the tank. I can't get it behind the tank where it is set up, so it's running on the side. Next time around, I'll hopefully have space behind my tank a bit more, and put an Aquaclear on it. I cut some AQ sponges to fit, and put in Api Biochem Stars in there instead of what it came with, which I assume I shouldn't even bother with (2 carbons and 2 of something else meant to remove ammonia). Right now I did the compartments 2 and 2, (I guess this means when it's all said and done, I'll have a ton of established media).
I also put a pinch of food in there last night. I figured that wouldn't hurt anything, and might feed a little phosphate to the bacteria.