POWER HEADS

[GaryP]

and one pointed up to the top to vent the carbon

Could you explain what you mean by that? I don't understand what you mean by "vent the carbon."

[Polkster13]

Pop-eye is usually a bacterial infection due to stress (usually environmental factors); air bubbles in the gills have nothing to do with this ailment.

Gary, I think he is referring to carbon dioxide and not GAC.

[GaryP]

I thought so, but you never know.