Reddit reviews CACTUS and SUCCULENTS Fertilizer for Plants NPK 5-5-7 COMPO Premium
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Special Fertilizer with the Unique Bio Stimulator PAA for all Cacti and SucculentsCompo cactus fertilizer with extra potassium for increased resistanceNPK fertilizer solution 5 + 5 + 7 with trace elementsUnique Bio Stimulator PAA for healthy growth and magnificent Blooms
I've learned tons of helpful things from CactiGuide.com! There are lots of articles and if you click on Cacti Talk you can find a forum and search for more specific and in depth topics there.
I'm not sure about lights as I'm still learning myself, but I have read up quite a lot on fertilizer. Organic fertilizers tend to have more micronutrients/trace elements so they are "better" if you can find a well balanced one. As for NPK, you want something that is somewhat low in nitrogen, but not too low as a deficit in one nutrient can hinder the absorption of others. Nitrogen can be added to fertilizers through different sources - a common one is urea but this kind can burn cacti so it's best avoided. From what I've seen urea is more commonly used in "general" fertilizers but it's still good to check. It is also a good idea to dilute fertilizers and use them with your normal watering schedule during the growing season so the cactus has a more even flow of nutrients instead of being bombarded with nutrients it will have a hard time using up once a month or so.
Compo makes a really great fertilizer with NPK 5-5-7. I've had awesome results with it.