IDK what to do

[snipesxxx]

ph keeps dropping to 6 in 24 hours and I think is whats causing the stall. I tried putting a cup of water straight from the tap and and cup from the tank and letting them sit 24 hours. Tap reads 7.8 straight out and 7.8 after 24 hours. Tank water remains the same after 24 hours.

What gives? Is it the fishless cycle doing it? If so how do I fix it?

[William]

It is mostly likely due to some of you decorations. What do you keep in the tank?

What filter media do you use?

[snipesxxx]

29gal, 2 pieces of drift wood, two rocks. When it started doing this I removed everything and still does the same thing so I put it back. Media is just what came with my tetra whisper 20-40.

[Red]

The driftwood would lower it some, but not 1.8. Sometimes ph drops like that. I would love to have PH that low..