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Hoovercat has correctly identified the plants that tend to have problems with Flourish Excel. In addition some people have reported having problems with a few other plants like Riccia, but so far this has been unconfirmed.
someone just confirmed the riccia through a double dose....ok, so I guess I wont be using the Excel.....I was planning on getting some Vallisneria Nana.
The vals that I had no problems with using excel is corkscrew vals. They seem to handle it well, as long as you aren't overdosing it. But the jungle vals I had just melted completely away.