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Hornwort is a very hard, easy to care for plant that is never sold in emersed form, so I have to disagree with the first diagnosis. It sounds like a nutrition problem for sure. Crypts have robust roots, so they are probably the last holdouts because they still have some reserve energy to draw on. If you don't at least get some nitrogen in there asap, everything will rot.
For a low tech setup with those plants, you would have a much easier time using a dirt substrate. You wouldn't have to worry about fert dosing and you'd even get a little co2 boost.
For a low tech setup with those plants, you would have a much easier time using a dirt substrate. You wouldn't have to worry about fert dosing and you'd even get a little co2 boost.
