Mark unfortunately that looks like cyano to me as well. I have battled it a couple of times in the past *knocking furiously on head*. I have found that it seems to consume and thrive on PO4 and because it consumes it your tests will still come out at normal. If you are feeding a lot of flake food, or frozen mysis/brine shrimp these tend to be very high in PO4. You may want to make sure that if you aren't already any frozen food be well rinsed with RODI water before it is feed to your tank and maybe cut right back on flake food. Just my 2 pennies worth.
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