Where to put Purigen in AquaClear 30 HOB
So I picked up some Purigen and I'm trying to determine where is best to place it in my AC30. Right now I've got the Fluval sponge on the bottom, followed by some fine filter floss and the ceramic rings on top. Common sense tells me to put it under the ceramic rings so they stay on top and stay the cleanest/get the most oxygen. However putting the Purigen under the rings causes the ceramics to not be 100% submerged. Any ideas?