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Maybe the "hard" bunch is emersed grown and will change to be softer variety when its leaves become aquatic (shrug :)
Only other reason I can think of is that its "old" came from a failing tank...not enough nutrients....but hornwort is hard to kill so maybe it valiantl attempting to give its best shot at living. I had some cabomba get nearly wiped out when one of tanks bio filter crashed (antibiotics/antiviral...heavy guns brought out kill infection of pet store betta!) And when bio filter crashed, algae and floating plants (duckweed, salvia, and dwarf water lettuce) grew rampant which blocked light, killed many plants but cabomba lived but it's smaller and feels different...coarser. I am hoping that it grow,back tp usual self n,are not weak...and I, ll
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