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what are you feeding them?
Check your PO4 and Alk levels, they may be the problem on the cyano, also check your surce water that you use for top off and water changes with a TDS digital meter(not inline crap unit) and make sure you are below 2ppm.(0ppm is best)
Craig, I always recommend a dual stage DI at the end of the line for RO/DI, this works as a safe gaurd to reduce any TDS.
When water params check out, it then becomes a flow issue and sometimes older bulbs can have a negative impact. But do check the TDS, it is the first place to look.