I'm currently growing wisteria, anubias coffeefolia, crypt. retrospirals, ozelot sword, narrow leaf red ludwigia, hygro. corymbosis siamensis, green lloydiella and java moss. The only ferts I'm adding are Flourish and Flourish Iron (every water change) and I add the
recommended dosage of Flourish Excel every 2-3 days. Used in this manner, it's not terribly expensive, just don't buy the little bottle.
The LFS I go to has a sign in front of their Excel stock recommending diluting the dose in a cup or two of tank water before adding, and not to add it directly on your livestock (if you have anything like my rasboras that think they're getting fed when you move the lid and come to the top). Despite being safe to use, there's a crap ton of warnings not to get it on your skin or in your eyes, and if you read that the way I do, it vicariously includes your livestock. Just take a moment and be careful when you're handling it because chemicals
I also keep a large RCS colony in my tank and would swear under oath it is invert safe when used as directed.
Personal anecdote (I stress this as people can be very zealous on the subect): I was using root tabs in my old tank, but hadn't added any to my newer setup. To be honest, the root tabs seem like they were superfluous at this point, I'm still getting new growth at what looks like the same rate.