Paul pointed out to me that the Eheim filters have differing sizes of tubing depending on the model. The model I prefer has the ½? hose rather than the 5/8? hose. Do I understand it correctly that I must get a corresponding fitting Hydor InLine Heater? It seems silly that this is not a uniform standard size. It pretty much brings me down to only one Hydor model at 200W and not the 300W I was hoping for because it has a different hose size than my filter. Am I understanding how these parts work together correctly? I would ask at a store but none of my LFS carry Eheim. Thanks for your confirmation. Shango _______________________________________________ GSAS-Member mailing list GSAS-Member@thekrib.com http://lists.thekrib.com/mailman/listinfo/gsas-member