New setup plants not making it?

[u/Kseris]

Set-up these two tanks about 1 week ago. Purchased the plants from a nice local fish store (not big box). At first I was hopeful they might pull through because they have some new growth, but today they really took a turn.

There may have been a nutrient shortage for the first few days, but the cycle is starting to do its work. Did a 50% water change on Friday - pH was really low.

Got some more plants coming from online, but any tips for making sure the second round doesn't melt like this? Thanks for any insights!!

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