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Will Flourish Excel kill fish?

44079 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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YES flourish excel will kill fish when over dosed to much. I have done it.:( I would strongly recommend doing a water change now if it is not to late for your fish already. The best way of using the over dose method that I have heard of on here was to:
1) turn off you filtration and use a small squirting tool like a syringe or small baster to just target the worst areas.
2) Take all the fish out and cut the light time down to around 4 hours then treat with excel and after 12 to 24 hours do a large water change 50% to 80%.
I hope this was helpful maybe someone with more knowledge on this can give you more ways to deal with the algae and not endanger the fish in the process.
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