I wasn't exactly sure how to prune my hornwort when it reached the top
of my tank. So I just lopped off about 8" down and stuck the top back
into the gravel. The top seems to grow nicely, but the trimmed off
seems stunted.

I have now figured out that it is best to cut the side shoots off, but
what do you do when the plants reach the top of the tank?

I'm trying to create a really bushy look in the back of my tank.

Rick