EVERYONE and I mean EVERYONE has an opinion on fertilizer, no matter how long they have been growing orchids! What works for one person, not only may not work for you but may be unavailable in your area/country.
You need to start your search by going to the tool bar on this forum site, click on the Search icon, pull down the box and type in fertilizer. Last time I looked, there were 500 threads on fertilizer! Read, read, read!
If that is not enough information to snaggle your brain, visit First Rays Orchids and read what Ray, who has done considerable research to back up his statements, has to say about fertilizer - what to use, when and why. Learn what nutrients orchids need and what time of year they are best used. Then you can make an educated decision on what you feel will be best for the orchid genera you grow in your location.
Cym Ladye