Normal sized gouramis.
Eg, lerri, dwarfs' etc, Flagfish should also, most worm eating fish that grub and pick should go for them.
I think this is better than chemical control.
Worm's are tough to kill that way.
Salt works, but kills the plants.
You can remove the plants, fish etc bomb with high salt etc.
But then you can use all sorts if you go to that extreme.
Regards,
Tom Barr