Anubias should do fine with glass beads as it needs to be anchored to something in the tank (such as driftwood or other decoration) to keep the rhyzome out of the substrate or it will rot.
I'm not sure how the sword would do. They feed heavily from the roots and make massive root systems, so it may depend on the size of the beads.
Flourish Comprehensive is a really good general fertilizer. It seems rather expensive compared to other ferts, but it's extremely concentrated and the bottle will last a really long time.
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