i think the easiest way to thin a lawn of tennelus is to pull out some of them. cutting leaves from the tennelus is tedious and may not thin it out by much. Moreover, doesnt look nice that way. so just pull out a few clumps and you should be fine. the rest will repopulate the foreground in a while.
hope you dun create to much a mess uprooting. doing it before a water change would be ideal.
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