Just wanted to say it's nice to find like minded people out there. I'm a fish lover too, and just got my tanks up and running a couple of months ago. I have a 36 gal with guppies, cory catfish, and cardinals. The guppies have already dropped fry and I was going to transfer them to the little bookshelf tank which is 6 1/5 gal. I did some tests first..all ok...except the Ph is WAY too high in the small tank. It's ok in the bigger tank, but 8.8 purple in the small tank, so the fry are taking their chances in the big tank until I can catch them all and put them in the breeder net. What shall I do to lower the ph and get the tanks the same?