Po4 at 0.04 ppm is great. Po4 at 0.00 ppm is not good. If you had more it rate in your tank you'd probably be able to keep PO4 down without the PhosDown.
What do you have for clean up crew? What type of lights and what is the light schedule?
When you do a waterchange do you clean off the rocks with a baster and vacuum the sand or do you just take water ot and out water back in?
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~ Mindy
SPS fanatic.
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