Activated Carbon and PhosGaurd

yeah you can, but carbon works better at lower flow rates, i have mine in a filter bag just hanging in the back of the tank behind some rocks. I give it a shake every few days and replace it every few weeks.
 
I would suggest using GFO (granular ferric oxide) as a phosphate remover instead of the aluminum based Phosguard.

Aluminum in the Reef Aquarium
"Aluminum is an ion that does not get much attention, and has no clear biological use in aquaria. It can, however, have an impact on aquarium organisms if elevated sufficiently over natural levels. Phosguard has been shown to release aluminum to artificial seawater. Further, it appears that the release of aluminum could be the cause of the effects that some folks have seen in aquaria when using aluminum-based phosphate and silicate absorbing materials."
 
Someone did a study of Phosgaurd. Conclusion: if you follow the directions it will not add Aluminum significantly to your water. The directions, among other things, say to rinse it very well and use it only as needed.
 
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