FAQ: Is it possible to overdose Seachem Replenish™?

It certainly is.  Fish prefer their GH to be steady and within a set range for that species.  Use of multiple mineral supplements or too much Replenish™ can raise the GH higher than is ideal for your fish.  We always recommend to follow the dosing instructions closely, and to only re-dose this product when doing a water change and according to the volume of new water being added to the system.