Alkalinity Problem

[ranchu dad]

I did a test on one of the tanks tonight and I got a reading of 300 for my alkalinity. I have been trying to find a solution and can't come up with anything. I tested it twice and so I feel the result is true. The PH is 7.4 so it's not a problem. I hope someone can help and tell me what to add or how to fix this problem Thanks

 

[johnptc]

what gravel and decorations are in the tank ??? fw or sw ??? i am not sure what the problem is.....do you want it lower ?? if so why ???

also i am assuming its 300 ppm ???

also see http://www.drhelm.com/aquarium/chemistry.html