Clams do not require high flow, they do better with low to moderate flow. A 30X turnover in a small cube tank will actually have negative effects on clams, too much flow and too much substrate movement will cause the clams to stress out. A pump rated at around 600GPH will be all you need providing over 10X actual turnover which is better for clams.
Last edited by sphelps; 02-24-2011 at 02:30 PM.
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