I actually don't use root tabs anymore. Not for any of my swords. Strictly liquid fertilizers.Have you attached swords to wood for long or is it a new experiment? I think you're a better water column fertilizer than I am, mine sometimes get root tabs. But an interesting idea. I have a half grow amazon? sword that might be fun to try, maybe it will "bonsai" it? It's that or give it away soon.
As usual your tanks look great!
Theres been some proof I guess that aquatic plants will take fertilizer from where it's available, the "root feeder" thing being somewhat of a myth. Tabs still help, sure because the plants will still use the nutrients from them, but they will also take from the water column just as well if that's whats available.
I didn't really believe it at first either, because it went against a lot of what I've read.
But, been trying it out for the last year and have to say I have personally seen evidence in my own swords grown just with liquid ferts.
This one especially looking good, this one's liquid ferts too.