Hi guys, I need some help.
I've had my tank set up/fully cycled for about 4 months. I have always had stable ph at 7.6 (it's about 8 out of the tap). Yesterday I removed and cleaned 2 pieces of driftwood (in bucket of tank water)
which were starting to be covered in brown algae. I also siphoned the sand which i do once a week.
A few hours after the clean up I noticed my fish seemed to be breathing heavy and I found my ph dropped to about 6.6 - all other parameters looked good (0,0,5). So I changed about 30% water and went to bed.
This morning the fish were looking very stressed, all huddled together and at the surface. I knew it must be the ph and sure enough it dropped to about 6.4. I did water changes over the course of a couple hours and they fish were looking much better - normal infact (pH then was at about 7.2ish).
I've been monitoring the ph today and again its slowly dropping and I don't know why. I assume it has to do with the driftwood cleaning but not sure what i can do about it. There have been no other changes or additions to the tank.
btw the driftwood has been in the tank since initial setup but this was the first time i cleaned it.
For now I am just doing 10% water changes every few hours to keep the ph at around 7.2 to 7.6. Any other ideas what I can do?
Tank - 55 gallon
filter - eheim 2217
Fish - 15 neon tetra, 12 lemon tetra, 3 bolivian ram
substrate - sand, river rocks
driftwood (malaysian), no live plants- fake
ph - now about 7
nitrate 0 (very low due to all my water changes today, normally 20-30)