The California Coastal Commission’s stated concern that a proposed Huntington Beach desalination plant’s intake pipes pose a threat to small and microscopic plankton has been rebutted in a letter from three prominent California marine biologists. Anthony Koslow, Eric Miller and John McGowan-marine biologists at Scripps Institution of Oceanography in La Jolla-were responding to comments made at a Dec. 1 panel about ocean desalination in Ventura County by Tom Luster, the agency’s lead staffer on the desalination issue.