It is my experience that heavily rooted stems will regrow even if you cut them down to 1-2". The plant does not try to regrow leaves with holes or algae, so trimming away the parts with algae could be beneficial to the health of the plant if the plant is covered in algae.
As for ferts, you can mix dry powders or use a general all in one like nilocg, easy green, seachem's lineup, etc.
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