Do I need lime in this mix?

[creister]

I am going to grow tomatoes in buckets and HEB this year. I have done it in the past with peat based mixes such as Pro-Mix. I added 2 cups lime to HEB, and about 1 cup to 5 gallon buckets. I have lime and gypsum. I know at Earthbox website the instructions say to use dolomitic lime. Can Gypsum be used instead?

This year, I am using a recipie to make my own. I am wondering if I need to add any lime to this mix.

Mix:

40% coir fiber
40% compost
10% expanded shale
5% lava sand
4% alfalfal meal
1% greensand

I know there is calcium in alfalfa meal and that coir fiber is not as acidic as peat moss. I also have very alkaline water. I have some plants in 5 gallon buckets and some in 18 gallon HEB