What's the best way to prune glossostigma?

Mine has been growing like crazy and has grown back over itself several times. I therefore have a 2" thick "lawn" all along the front of my tank. Some of the leaves on the lower layers are beginning to turn yellow, so I think some pruning will be necessary soon.

I could easily pull off long strings of the glosso, since the upper strings have very little of their roots reaching the substrate.

I think I should have done HC instead.

Thank you in advance.