The plankton cycle. Green to brown to clearing back to green . Connect the points (cause and result) and you should have an answer Bruce.
What was an epiphany for Bruce was a real head scratcher for me. But, at the risk of looking really stupid, I'll take a guess at what you mean. Just remember: "There's a fine line between clever and stupid."
Are you saying???
Green water (phytoplankton bloom) -> Brown water (zooplankton emerge to eat the phytoplankton) -> clearing water (phytoplankton are consumed and zooplankton die off) -> back to green water (reemergence of phytoplankton bloom)