Ditto to the above comments, but one other suggestion about avoiding tension problems. Be sure you use the same weight and type of thread for top thread and bobbin. If the bobbin thread is a different weight, it can cause tension issues (I've had that happen to me).

That happened to me recently - had the tension just right then had to change bobbins UGH what a mess! Had to rip out and adjust all over again. Learned the hard way to do a test after each bobbin change.

This is a very timely question for me. I did FMQ on a tablerunner yest. using an off white thread on top & a brown in the bobbin. No matter how much I practiced on a scrap sandwich & kept changing the tension I still ended up with a bit of brown coming up to the top. I was just sick since the runner belonged to somebody else who doesn't do FMQ. I felt I ruined her runner but she was happy with it.

On a tute video I watched yest. the person said to really crank the top tension up to a very high number. Like 8. I didn't think to go that high.
I'm anxious to see how others manage this.

I have used the stitch-in-the-ditch technique on 4 quilts. All had much different colored backs so I used the matching color for the backing in the bobbin and the other colors of batiks and vintage colored squares/triangles, etc. for the top thread. They all turned out very well. Great blocks on the back so that they could be used as quilts on both sides.

I have also done that.

I use different thread on the top and bottom frequently and have not had any problems to date-knock on wood! Good luck!

Your neighbor in Iowa!

I usually use the same color thread.

I have done this often & have not had a problem.