[helene schoubye]

How about light ?
I have some troubles as well with the ceratopteris, – but its strange because in some tanks they grow fine and in others they dissappear.
But with some of my other ‘floating’ plants, I realized that they do really also like light, – I use salvia natans a lot, and its quite clear that the ‘stripe’ underneath the led light panel is far better growing than in the dark corners.
I use two kinds of led light strips, one with a clear light and one with a more yellow light, – and theres a difference in growth as well between these tow types of light.