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Will Flourish Excel kill fish?

44227 Views 13 Replies 11 Participants Last post by  Michael
I have terrible hair algae boom so I decide to over dosing Flourish Excel to kill them. Actually, this is my first time using the Flourish Excel. I got it last night and put 25mlx3 in my 55gal tank. This morning, the hair algae does look thinner and this is a good thing. But I notice the platy and cat fish looks weird after I add the Flourish Excel. They just don't move that much. I even suspect they are dead. Should I do water change ASAP or just let them sit in until the hair algae get controlled?
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I have dosed excel for years. I've never lost a fish. I dose at the initial amount recommended. I squirt it on the algae going around my tank every day until I have hit all the places I see the algae. I leave my filter running unless the algae is right where the filter blows. If that's the case I turn it off for only about 10 min and then turn it back on. Excel has a tank life of 24hrs so you should be able to do this every day.

Excel doesn't kill some of the hair algae. It does great on BBA. Could that be what you have?
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