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ĀdaizeUK said:On the second pic you seem to have some GSA and/or diatoms on your older saggitaria leaves, but none on the healthy new growth. Ā This might be a sign of a plant that is settling into a new environment and winding down old leaves in favour of new acclimatised growth.
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Or your plants might be telling you that they'd like more nutrients. Ā What fertiliser are you giving them?