I just bought the xp1 for my 30 gallon and I couldn't be happier, it's just a great filter. BTW
, whatever you do, get some prices online before
going shopping for one. I got really gouged and was p.o.'d when I got home and found that I could get the xp3 for the price I paid for the xp1. But, so far it's a great filter, and as the xp3 is just a larger version, I'm sure you'll love it.