Top pic- the green on the left is Hygrophila difformis (Wisteria) which is presently converting from emmersed form to the shape it takes underwater
Next plant to the right is Ludwigia repens or possibly Ludwigia rubin. The growths shooting downward are areal roots. Its normal, some species do it more than others. You can pinch them off at the stem or just leave them
The floaters on the far right, best guess is Amazon Frogbit but it looks a little strange, might be something else
The clumps of grass down front looks like Eleocharis parvula AKA dwarf hair grass. There are a couple other varieties which are all similar, main difference is size, so it might be a different variety
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