here are a few things to use
As for enrichments, there's Kent Zoe, Zoecon, Naturose, Selcon, Vita Chem to name a few also phytoplan, spirulina ans cyclopeze
you dont have to use all of them, I use selcon and cyclop
there are some good posts on sea horse dot you know what about gut loading or enriching
I have a 2 gal that i keep either brine or ghost in. I feed my horses mainly PE mysis