I've never had ph problems until last night. The ph crashed from about 7.2 to about 6.2 VERY quickly. I had JUST checked the water parameters 4 hours before the crash. Readings then were:
I didn't realize anything was wrong until the fish told me. I've got a couple in hospital tanks now, recovering very nicely, but lost a couple fish :/ The rest of the fish in the tank ALL went to the surface and were breathing pretty heavily there. I checked the water quickly after doing some emergency work with my favorite angel who was quite near death :/ The readings were:
ph: about 6.2
I did a few small water changes and they calmed down and started breathing ok again. That was at about 8am. I gave it a couple hours before checking the water again. The readings after that change were:
The ph has gone down since then to about 6.7. I added some ph UP (ran out of baking soda :/) and will do another water change in the morning.
I did change this tank recently. I converted it to dirt using organic Miracle Grow capped with play sand. I also got new canister filters, but ALL of the media inside both canisters was totally cycled and had been for a MINIMUM of one year. After changing out the substrate, I waited a couple weeks, doing water changes and watching the parameters, and once it was stable for about a week, I planted the tank and waited another week. After that week, during which the water parameters were all good, I added the fish back in. That was a couple days ago. I kept checking the parameters up until about 4 hours before the crash. Only now am I have ph problems :/ But the most different thing about the tank is the dirt so I thought that maybe that's what it is. If it is the dirt, then I need to know how to fix this! The fish did kick up a small bit of dirt, but I didn't think that would do anything. Should I add more sand? What can I do to get the ph stable?