Pan World all the way. The guy was an engineer for Iwaki and left to build a better mouse trap/water pump. I use a 50 PXX on my 200 gal. For a 30 to 60 I would use a 40PX. There are a lot of companies that use Pan World to build there pumps and just paint them a different color. In the old days Iwaki was the best because your only choice was Little Giant. Good pump just loud.