I actually tried a super concentrated dip tdy on one of my small pieces of LR as one of my mini plates fell off and I wanted to stick it on the LR.
8 drops in 250ml of NSW, dipped the LR for 10 mins. Within 1 min, 2 worms fell out and mati. Then put my mini plate inside as it was injured, half of it was jelly. Dip for 10 mins and all the jelly disappeared. Stuck the mini plate to the LR and dipped both in fresh NSW for 1 min. Then put back into my tank.
Doesn't seem to have any ill effects on the mini plate. The half of the mini plate that is not injured has expanded normally.
Normal concentration is 30 drops per 3.8L so I should have 2 drops in 250ml. What I dipped my LRs and mini plate in is 4x the concentration and no ill effects found.