"Todd Nicholson" wrote in message
ink.net...
..and instead of stirring up the sand to remove the red slime, siphon it
off
the top during water changes. This actually removes it instead of just
stirring it around to grow elsewhere.

The PS should take care of any nutrient that the RedAlgae need to grow.
Other possible reason a
Overfeed
Bad bulb
Die off
Unefficient skimming of PS

Or maybe the RO/DI maybe not efficient that may need changing a new
cartridge.The TDS should read near Zero.

CapFusion,...