Is there something else I can use instead of pine bark?

I can't say...not sure myself, but hopefully my comment will keep the thread up top so others can see it..

Andrew, it looks good to me. Pine bark mulch is what you want to use. Some people sieve it (once) through 1/2 inch, as you did, and use it directly while others sieve it through 1/8 inch to get rid of fines which results in a more water retentive mix.

looks good.

Awesome thank you.

5-1-1 is the most used medium throughout the commercial nursery world. Except the ingredients used by the commercial nursery growers is just a little different then what most citrus hobbyist on this forum use . The worlds most used container medium consists of 5 parts bark, 1 part peat moss, and 1 part coarse sand. - Silica