Coby, I am NOT (I wonder if I could type that word even bigger?) a chemist... there are people on this list far better educated about how water and everything therein "work." Having said that, I don't think peat buffers in any way useful to an aquarist (ducking and running...?). Your post this afternoon said that the pH was 6.3; that of this evening said it was slowly rising, you had added pH Down, and it is now 5.5. Thing one: if you have peat in water with almost no hardness, you either have some really weird peat or you have something in the tank adding alkalinity to the water (gravel, rock, shell... SOMETHING)... you need to identify and remove whatever that is. Thing two: the extreme pH shifts which your water is undergoing is WAY too stressful and unhealthy for fishes (and plants); it is far better to use a storage container for your water and do all adjustment of water values in there, changing water from a stabilized tank with water of the same chemistry. Curious about your having started with 30 fish and having 8 now...? Martha ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@listbox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@listbox.com. apisto-digest@listbox.com also available. Web archives at http://lists.thekrib.com/apisto Trading at http://blox.dropship.org/mailman/listinfo/apisto_trader