You can submerge the whole lot (by some meshh over it, or the like) - and I mean submerse ALL plant material for about 24 hours.
- planys, incl. Limnobium, will survive this.......but I very much doubt aphids will.
Aphids will, however, sit on surface tension, but most fish will love such supplement to their diet.......😎
edit: Darrell is just faster in typing, than I am.......🙂