water circulation/mulm buildup
I'm having trouble with mulm buildup and water circulation problems in my 20g long. I have black diamond capping MTS. I do a large water change with a vacuum each week trying to get it looking manageable, but it builds up again very quickly. It pools along the edges of the tank, especially the one opposite of my filter, and on my carpeting plants. My tank is pretty well planted, and it's been frustrating having such a gross looking tank after working so hard each day to maintain it. I currently have 3 otos, 1 farlowella, 12 green neon tetras, and a GBR. Aquaclear 30 filter.
I'm starting to get staghorn algae, and they recommend increasing flow and decreasing mulm to start battling it. Can anyone recommend what I could add to help with this? The vacuum I'm using doesn't have the best suction anymore, either, just enough to uproot my plants :p Any recommendations on a good one I can use with sand?