Is it true that seachem flourish excel will cause hornwort to melt? I use it in my 38 gallon and want to add hornwort, but not if it'll just kill the hornwort.
Yup, it IS an algaecide. Glutaraldehyde is used to sterilize medical equipment so the side effect of being an algaecide also carries over to more primitive plant forms like vals. Not sure about hornwort.I may go less then half. Excel has some kind of algaecide in it, and some plants just do not do well with it (hornwort being one).
Try about 1/3 normal dosing, or less.