Re: Plants won't root! Don't know what to do.
If the crypts are new to the tank, leaf melt is very common - they will bounce back. With water sprite just lay the roots on the substrate and put a stone on them. You can also let it float. If the new roots still do not grow then up your ferts a bit. If that does not help then we need to look into your conditions more as water sprite does not really need much of anything to survive.
With stem plants do what florists do: make a new clean cut right under the bottom leaf node (spot where the leaves come out of the stem), strip off 2-4 sets of leaves above the cut and then plant. If they still fail to root, repeat the above and let the stems float. If the floating stems fail to grow new roots in about a week then something else is wrong - good time to run water tests.
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