Not sure how long the actual chemicals last but I've been using jobes sticks to grow some plants in vases (just the roots in water) and the stick takes a long time to dissolve, probably 3 months before the stick is mostly disintegrated, considering in the tank they are protected by the gravel I wouldn't be surprised if you pull out the plant and some of the jobes stick is still wrapped in roots.
I would think that if you were to do a 50% water change after replanting you should be OK. That's what I do when I need to disturb the gravel.
Hope that helps
Giancarlo Podio |