1 of my tanks is a 55 gallon sand tank. I use it as a breeding tank for my Jack Dempseys. About a week ago I did a water change and also ran a diatom filter on the tank to really get the water clean. After I do this my fish usually spawn. The next day the male beat the female so badly I had to move the male to a differant tank. The female was in bad shape. I treated her with stress coat and some Ick med. The next day I thought she was going to die so I treated the tank again with just stress coat. She started doing a bit better. yesterday 3 days later I went to do a water change and my ph was at 4.6. I drained out 15 gals and only added back 5 gallons. This brought the PH back to 6.0 I know to high to fast. Now here is the shocker! This afternoon only 15 hr later the PH has dropped again to 5.3. What is making my PH drop so fast. This tank has been running about 5 years. The sand makes it low anyway to about 6. This sand makes it to low and I want to swap it out. but what makes the PH drop this fast. Please help me stabilize my tank so I can save a great breeding pair of Jacks with Blue Genes.
