northtexasfossilguy

Basically the pH will go from around 6.8 or 7 down to 5.7 in four or so days, it's been that way for a while.

I'm not sure what the deal is, but I suspect it's because the gravel bed is very deep and there are anoxic bacteria that are consuming some of the water nutrients... ? It's twice what it originally was as I added some to make a tiered shape and that's when it started.

Another factor are the snails that I had in there, I finally sold most of them but having so many pulled considerable amounts of calcium out of the water.

Any thoughts? I hate to dig it all up and start over but it's looking like removing some of the gravel is the only way to deal with this.