You can do whatever you like. But clove oil is just as it sounds, an oil. It will coat the top of your water column and leave a gross residue. I would never willingly use it on a main tank of mine. It’s not easy to clean out either. So you do you bro.
I do agree - if you can get your tongs close enough to the piranha with out the net, that will work. But once again good luck. Not sure if
T
Tj203
has dealt with a pack of piranhas at this size or not, but I have dealt with lots and I would personally net it against glass, this in itself will most likely knock the plant free, but if not have the tongs ready.
but yes I do agree it needs to be done ASAP if not done already.