Join Date: Mar 2016
Location: Philadelphia, PA, USA
I tested the water a few minutes ago, and it's back at 7.5. I did a 25% water change two days ago, because it was at 8.2, which I thought was dangerously high for my betta (what if it started rising from there?). Yesterday, it was at 8.0 or maybe 8.05. That is what I expected to see today, not 7.5. All the other parameters are ideal. Hopefully it'll stabilize now.
I spoke to a knowledgeable person at an LFS, and he thought it was the Leaf Zone. He thought my plants were probably already getting what they needed, and the excess iron was raising my pH. The pH in the bucket with the ornament has been rock solid at 7.5. I know it's too soon to relax or draw any conclusions. I'll continue testing daily.
Even if the ornament turns out to be inert, I'll go with real driftwood instead. 7.5 is at the high end for a betta, so I'd rather have something that brings it down gently.