Hi all, It is a good point, they don't enjoy being bashed around.
I'm not sure about what's in the aquarium based literature, but there is scientific research that shows that you get holes in the leaves with iron deficiency, in Lemna it is one of the first signs of iron deficiency. iron (Fe) and manganese (Mn), are the two most likely, and are both involved in chlorophyll synthesis.
I would be very, very surprised if it isn't an iron deficiency.
I do get what u r saying and I did read through the link that u provided. Have ordered florin fe which contains both edta and gluconated forms. But the thing is that I have dosing iron regularly only recently.. probably last couple of months. Before that I used to skip dosing for weeks together. But my plants grew without these peculiar changes. Especially the l. Aromatica blossomed well. If course it used to grow well and then lost all it's bottom leaves and finally the stem used to melt away. That was again a time when I used all 4 lights too. Manganese def was in the back of my mind though.. the holes in some of the plants like the korymbosa compacta r intervenular.
If u look closely there u can c those holes. But again I am just speculating. Maybe as Clive said there is probably more than one problem here.
I will post a video soon for the flow.
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