Best root ferts for huge swords?

[WhistlingBadger]

I've been using seachem flourish tabs every three months or so, but my swords, ironically, don't look like they're flourishing. Curly leaves, holes, less-than-lush growth. Thinking about trying a different kind of fert tabs. Any recommendations you've had good luck with?

 

[fishorama]

Those only dose micros, no macro ferts (NPK). I use Job's palm & fern sticks mostly. You can break off shorter pieces. For big swords I use ~1/2inch bit placed on 2 sides. I have used others but don't recall the names. I've tried Osmacote but hate the little balls that can surface.