08-13-2013, 01:40 AM
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Excel is completely different from Flourish, and contains stuff that isn't natural in the environment. I can completely see why that would kill/harm a fish, as it's pure chemicals.
I dump Flourish on my fish all the time. I just kind of pour it in a stream along the top of the tank and all the fish come to investigate, thinking it's food I suppose. No one has ever had any adverse reactions to this.
I may be wrong here, but it is my understanding that Flourish just contains a concentrated amount of nutrients that are found in nature (ie, what naturally occurs in lakes/streams/rivers from the soil, fish, rocks, the whole ecosystem.) So it can't really hurt them unless you dump a whole bottle in a small tank, and even then I think you'd just have a lot of algae. This is me just speculating though.
But I've never diluted it, and never had a problem. I honestly wouldn't worry about it :)