Originally Posted by ellisz
What sponge would you recommend? I have tried phosguard and no changes seem to be apparent.
Phosguard does work you just need to change it out quite a bit in the beginning. Almost the whole 1 lt jar would be needed just for a 75 gal
tank I found. If you have corals though I would not recommend their product but should be okay for FO
systems. If you can find it try Phosban or other iron based products
I have also read that cheap carbon can release phospahte back into the water. Is this true?
That is actually true of even the more exspensive brands. All forms of carbon have some level of phosphate unless chemically bonded. If you do a google search you will find PO4