dean1987 Posted June 26, 2004 Share Posted June 26, 2004 Hi all, I've got a 4 footer with sandstone used as the main rocks. Everytime i do a water change and test the PH, i always get a reading of about 8.1. I was just wondering if this is caused by the sandstone buffering the water or if its time to get a new test kit. Cheers Dean Link to comment Share on other sites More sharing options...
anchar Posted June 27, 2004 Share Posted June 27, 2004 Hi Dean, It depends entirely upon the source/chemical composition of the sandstone...ie. if the sandstone is of marine/oxidising environment, then it will contain CaCO3. These types of sandstone buffer your water. Try this link Rock article merjo Link to comment Share on other sites More sharing options...
CThompson Posted June 27, 2004 Share Posted June 27, 2004 I certainly wouldn't debate Merjo on the topic, as he will be correct. I think though it would also be fair to say, that usually, sandstone won't affect the tank. In your possition, I would take some water to a shop, or friend and have them test some of your water. If it dosnt' show the same reading buy a new one and take it from there. If it reads the same, then you might try testing the water from the tap, the water in your tank after a water change, and the water before a water change. From this you will be able to determine what, if anything is happening to your tank's water. You don't mention what substate you use, this can have a greater impact on water than your rock. Craig Link to comment Share on other sites More sharing options...
dean1987 Posted June 28, 2004 Author Share Posted June 28, 2004 Hey guys, Thanks for the input, i use plain aquarium gravel that you can buy from any LFS. The test kit seems to be working fine... so it might be the sandstone. Cheers Dean Link to comment Share on other sites More sharing options...
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