simon, one thing i did with my acrylic tank(also my first) is went with less sand and kept it in the middle of the tank for the most part. there is some near the front and sides but not a lot. since my tank is a cube and the pumps are on the back wall, eventually the flow moved all the sand into the center part of the tank or along the back. this worked out perfect for me! and helps keep the sand from the front viewing panel.
corey
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