BTW in this case I say "depth" when I mean the front-to-back dimension, and I use "height" as the bottom-to-top dimension. Depth is a bit confusing since people think of "depth" as the sort of "negative altitude in water" when in the ocean, but with tanks it seems to mean the front-to-back in that you specify dimensions usually in the order of lwh ("length, width, height") so with your tank it's 10'x3'x2' but then you're looking at it from the long side so it gets all confusing like.
Anyhow sorry for the tangent.