While cleaning my tank today I came across what I would assume to be
some sort of insect larvae which must have came in when I got some new
plants a few weeks ago.

It was about 3/4 of an inch long and looked kind of like a centipede.
It's body was translucent. It had "glued" together a few leaves around
itself. I cut the affected area off of the plants and discarded it.

Any idea of what it was?

I wouldn't have saw it if I wasn't trying to replant a plant I knocked
loose.

Thanks.

Aaron