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Yea the sand bed will be clean in the morning and then after a couple hours the red will come back on the sand. Now there is red on the rocks which came when the red started on the sand but the rocks still look red and kinda hairy at night.I don't think thats cyanobacteria which is a bacterial mat that gets its name from its color 'cyan' (just like the printer ink). Most varieties are purple/red. Now having said that - cyanobacteria is a type of 'blue-green algae' (former name) - they are now known to be bacteria. There are some green strains.
Can you say some more about the 'stuff' - does it disappear at night, and re-appear after the lights are on for a couple/several hours/. (that suggests cyanobacteria). If there is no change during the course of the day (dark to full light) - I would say no. it could be multiple things