Well, I sort of feel that way about my 125. I was considering adding either a sponge filter, aquaclear 110, or even something somewhat crummy like a fluval 405 on the 125 and leaving the penguin 350 on a 55. The 55 will be very lightly stocked.
Thanks for the input, and I genuinely do agree, and this is why I asked. I want the best for my fish, not half-assed poopwater. Plus, I get an extraordinary discount at work. The xp4 cost me 145 dollars. 4 Liters of prime costs somewhere around 54 dollars.
Thanks again!