[Nils A. Seastrand]

I must comment, if only to agree with Peter on this one. Lowering pH is one thing but making a pickle or a salad dressing is someting else.Lowering pH is important ,however, how you get there is just as important. I have used tannic acid for many years with very good results when used carefully. It was instrumental many years ago in successful breeding of a number of species of (blackwater fish). It is not an answer or easy fix but can be a usefull tool. I make up water for changes, etc. in my paros. tanks from steam distilled water with small amount of tannic acid added. This usually stands for about 10 days before using. Would love to here from any here who have worked with tannic acid. Thanks.