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You may want to try lowering the clams a bit first, and see how they respond. If response is unfavorable then move closer to light. Clams respond differently on the individual level, therefor generalizations shouldn't be made as to specific species of clams loving more or less light. I found this to be the case for my clams (they responded just the opposite as to what light requirements for each type were specified). This may differ for you though, so just try a little experimenting.
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