01-11-2010, 07:24 PM
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Don't let pictures fool you! The trim around some tanks is not the same as others. One trick I have used is to take black electrical tape, wrap it across the bottom edge to make the trim appear higher, so the sand does not look so deep. Plus, I try to really stick to the 4'' depth, and not push much higher.
But no, i would discourage a slant. You will have different types of bacteria growing at different depths, as opposed to encouraging denitrifying bacteria across the entire sand bed. I wouldn't be opposed to a 3'' depth on the front glass, but you really want to get as close to a 4'' depth as possible, in my experience, to get the denitrification you are looking for.
This is something to consider on future tank projects. My original reef was a 38 gallon, which is a 29 gallon tank with an extra 4'' in height. I choose a 38 on purpose so that the height of the sand would not distract from the tank.