Also how much did you put in your reactor? You should start off at 1/4 the recommended amount then gradually increase.

mj 1200 should work as long as you did not overfill your reactor with pellets

Little below halfway.

I've been running my pellets now for 8 months and I still only have my reactor 1/3 full, you might want to start less pellets and that should also help your tumble rate. You may need to soak them a bit longer as well.

Thanks!! Will do.

One other thing, make sure you did not get any pellets in the tube when you were filling your reactor as that would restrict your water flow as well.

I found that I had to use a bigger pump the a mj 1200 when I was using a TLF reactor. Did you remove the foam & do you have the outlet from your reactor really close to you skimmer intake?

Why is the outlet from a reactor have to be really close to you skimmer intake?

It helps to remove the unwanted crud that the bio pellets remove from the water column.