Last month I tried making some food for my goldfish. It turned out quite well so I thought id share it with you guys

I'm not on other social media b t if you sill are you are more than welcome to share it with others

150gr mixed shellfish or shrimp
100gr cod fish
150gr peas
1 garlic clove
½ squash
½ carrot
1 teaspoon Kelp 
1 teaspoon Spirulina

(You can replace the algae powders with crushed multivitamins but it is not reccomended) 1½ teaspoon Agar (ideally more)

EDIT: I have since experimented some more with this, and found out that agar works best when it is boiled. Simply boil it in some water, before adding to the blend. Also use more Agar than described here