Reasonable contact with Flourish Excel (eyes, mucous membranes excluded)shouldn't be a problem. I wouldn't hold my nose over the Excel and inhale deeply, but it is relatively safe. I believe Brian is referring to contact with Flourish Excel as being non problematic.
I have also worked with glutaraldehyde. Any contact with glutaraldehyde would be a problem. It is a nasty chemical that should be neither inhaled or come in contact with skin.
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Contact for humans isn't a problem so I would assume the plants and animals should be fine if you don't overdo it.
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Remember, if you are dosing Excel to combat algae, you
are over doing it! You have to over do it for the Excel to work. Watch your fish!
Mike