I think I read some where's that all the ceramic bio's leach aluminum.@sp1187 I'm wondering if this issue is seen with the Brighwell products too since I just ordered a brick ??
Xport-NO3 Biological Filtration Dimpled Brick
Dimpled Brick Dimensions - 9.0" x 4.5" x 2.625" Why Dimples? The dimples allow for water flow to pass through when a single brick is placed on the bottom of a sump, or when multiple bricks are stacked one on top of another. Xport-NO3 is great for tanks that have minimal aquascape, or are heavily...www.marinedepot.com
but old guy.... so don't trust my memory.