A lot of energy goes into each leaf and so plants do not routinely lose them when conditions change. Plants lose leaves in response to nutrient, damage or a lack of productivity in a leaf (low light/emersed grown leaves are not adapted to underwater conditions).
Aquatic plants are not so delicate that they cannot handle being transferred from one tank to another. As long as all nutrients are present and there is enough light for each species they will grow healthily and not lose leaves.
Out of your list of plants, I'd expect some of the large sword plant's older leaves to melt away as it grows out new leaves. This is because most sword plants from the local pet store are emersed grown and the leaves have a thick wax cuticle that prevents the leaves from exchanging gasses and nutrients when under water. This makes the leaves unproductive and the plant salvages what it can from them by pulling out nutrients - this causes the leaves to die off.
Alternanthera's lower leaves will melt if lighting in the tank is low, you might also get some leaf loss if it was emersed grown.
The crypts are a possible exception to the above advice and sometimes melt for seemingly no reason, so be aware of that.
And finally vals don't like flourish excel so don't dose that in the tank or they can lose leaves because of it.
Lilies will also grow huge and take over your tank, shading everything else out beneath it, so watch that plant like a hawk long term.
And finally, sometimes anubias have anubias disease which can cause anubias to die, the rhizome becomes rotten and so do the leaves. Watch the plant if it starts to lose leaves (stems become mushy first usually) or the rhizome goes yellow/clear/mushy start cutting off bad bits and don't let infected parts touch other healthy leaves.
Aquatic plants are not so delicate that they cannot handle being transferred from one tank to another. As long as all nutrients are present and there is enough light for each species they will grow healthily and not lose leaves.
Out of your list of plants, I'd expect some of the large sword plant's older leaves to melt away as it grows out new leaves. This is because most sword plants from the local pet store are emersed grown and the leaves have a thick wax cuticle that prevents the leaves from exchanging gasses and nutrients when under water. This makes the leaves unproductive and the plant salvages what it can from them by pulling out nutrients - this causes the leaves to die off.
Alternanthera's lower leaves will melt if lighting in the tank is low, you might also get some leaf loss if it was emersed grown.
The crypts are a possible exception to the above advice and sometimes melt for seemingly no reason, so be aware of that.
And finally vals don't like flourish excel so don't dose that in the tank or they can lose leaves because of it.
Lilies will also grow huge and take over your tank, shading everything else out beneath it, so watch that plant like a hawk long term.
And finally, sometimes anubias have anubias disease which can cause anubias to die, the rhizome becomes rotten and so do the leaves. Watch the plant if it starts to lose leaves (stems become mushy first usually) or the rhizome goes yellow/clear/mushy start cutting off bad bits and don't let infected parts touch other healthy leaves.
