12-17-2008, 09:46 PM
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I doubt that the ferts would. I use flourish excel as a carbon source for my tank and everyone is happy and healthy. I have used flourish too, with no ill effects to the fish, but a huge algae bloom which is the reason I no longer use it.
The only thing that I see is that I wouldn't use all those chemicals that they suggest for a water change. Messing with the pH and GH of your water will likely cause more problems than it is worth. It is best just to use the water you have (assuming it doesn't have a pH below 6 or above 8 ) and just use a dechlorinator during changes. And, choose fish that are compatable with your water. Heck, if you have a high pH those products are unlikely to work anyway...trust me I know.....