scrapin coraline
 

Dump 5 gallons of vinegar into your tank. All the coralline algae will disappear. Oh, I forgot to mention, also your corals and pretty much everything else will disappear too! j/k

kent Pro scrapper with metal blade is the best way. You can soak powerheads in vinegar to dissolve it when you can bear it no more.

Hope this helps!

Kai-Wei [img]images/smiles/icon_biggrin.gif[/img]