I use this cactus food. Don't buy it at that price though. Wait until it is under $12. I basically put some of this in the water when I water them every 6 months. I am lazy about transplanting my succulents. As they grow, they take a lot of the nutrients out of the soil to the point that the soil is really poor. This puts nutrients back in the soil. Also, a lot of my succulents grow a lot during the fall and winter so I wanted to fertilize them before they start growing again.
I've actually been pretty successful with my succulents. A few I'm having troubles with and it is mostly the aeoniums.
I like Espoma liquid fertilizer and they have a cactus one (I just bought it and haven’t used it yet but I love the indoor plant one). Just be careful- it comes out fast and is a bit stinky 😂 Edit: you can get it much cheaper at a local garden center - I paid $6.99 for mine.
Espoma Organic Cactus Plant Food, 8 oz https://www.amazon.com/dp/B01JIRKYJ2/ref=cm_sw_r_cp_api_fabc_ARdXFbQ4QEW23?_encoding=UTF8&psc=1
These are 6-week progress shots. I used this cactus fertilizer and installed this indoor light, since I'm in a new apartment with very little natural light and I was tired of killing plants over the winter.
It is clear that most are growing - but they don't seem to be growing... healthily? They seem etiolated, and I'm wondering how that could be. The light is on 100% for 8hrs/day. Previously they were in indirect low light with about 4 hours of direct afternoon sun.
How should I adjust their care? I want them to be full and lush, which is why I bought the light - to avoid them getting lanky and pale this winter.