They can do fine.
I use it quite often, and in some tanks they just grow and grow as in all tanks, actually they can become pretty thick.
BUT … theres is one problem, – they dont like too low ph. Or at least they will need some time adjusting to a lower ph.
You will find that if you take some hornwort from a normal tank and put into a low ph tank, it will loose all its fine leaves, or needles. That is if the difference is too big.
But if you acclimatize it slowly it will settle and then it will tolerate it good. If I want to have hornwort in a low ph tank now, I take some from one of the other low ph tanks.
And of course also, they do need light. They will grow better with more light, – and I actually dont think that light as such bothers the paros, – the thick growt of the hornwort can provide just as much cover and shade as less light but no plants.
I never thought about or worried about nutrients being too low, I think its a sturdy plant that will do fine even with little.