https://www.amazon.com/Espoma-Organic-Cactus-Plant-Food/dp/B01JIRKYJ2/ref=mp_s_a_1_3?ie=UTF8&qid=1528336161&sr=8-3&pi=AC_SX236_SY340_FMwebp_QL65&keywords=organic+cactus+fertilizer

This is what i used this week i plan on feeding them once a month thank's for the comments guys. I'll definitely be researching coconut water and trichocereus cacti!:)