Floramax Midnight Black and pH
Has anyone noticed Caribsea Floramax Midnight Black causing pH to rise over time? I recently redid a tank with it because I prefer the look and wanted to be able to move things around more easily. My pH is now creeping up from about 6.8 (where it was when I had a mud tank) after a water change to 7.6 or so 3 days later. The tank contains plants, animals, floramax, and some driftwood, but it's acting like I've got coral sand in there or something. The water I use is RO, and I warm and stir it prior to adding it to the tank. Degassed its pH is about 6.8. I tried multiple pH tests as well, just in case it was the test's fault. All agreed.
The product is advertised as not raising pH, but I can't see the wood being the cause. Any suggestions? It's a shrimp tank, and I've lost 4 batches of bumblebee shrimp eggs since I made the change. I'm blaming the pH, just because I can.
I posted this a couple of weeks ago, just wanted to update it in case someone found it via a search. The answer is yes, Floramax Midnight Black does indeed raise both KH and pH. It's possible that I got a bad batch, but mine contained carbonate rocks. They looked like limestone chips, but could have been broken coral or shells or whatever. They fizzed violently when put into vinegar. It didn't have a large fraction of these rocks, but there were enough, spread evenly throughout the substrate, to mess things up badly. I lost a bunch of eggs and every one of my juvenile bumblebees died due to the high pH.
I currently have a thread going in Water Parameters about this problem. I only wanted to update this to make clear the result of the question.
Last edited by jasonpatterson; 02-20-2012 at 12:39 AM.
Reason: Problem solved, floramax = high pH