[GimpyFin]

Haven't used the all in one biopellets, but I've used Ecobak plus for 2-2.5 years with good success. Pellets in general do shed a film as they're consumed which is why a solid skimmer is important to pull that out of the water. This is also why it's recommended the pellets have a steady, gentle tumble (So they don't turn to clumpy goo) and that the reactor output is near the skimmer intake. I get a fair amount of brown sludge in the skimmer cup and throat, but not really anywhere else.