Best probiotics for homemade fish food?

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im thinking about making homemade fish for for my Betta to supplement feed alongside pellets. This is my rough list of ideas for ingredients.(all will be blended and frozen in ziplock bags)


Mostly(3:4):

Any White fish meat
Shrimp(peeled)
Clams or squid(look for discounted items)

Little(1:4):

Frozen Carrots
Frozen peas
Banana
Pinch of All-natural spirulina powder
Pinch of probiotic
Cucumber
Spinach
Pinch of Garlic
Broccoli
Zucchini
Apples?
Any other discounted fruits and veggies

Binding:

Unflavored gelatin


Does anyone know of a good probiotic to add that won't harm my Betta? I've heard of someone using culterelle, but I don't know which version to use...