01-02-2011, 02:40 PM
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As a recent new member, welcome to Tropical Fish Keeping forum.
Now, to really offer suggestions, we need specific data. What is the pH of your tap water? This should be tested from a glass of water allowed to sit out overnight or the reading may be inaccurate due to dissolved CO2 in the water that needs to dissipate out.
Second, what is the pH of your tank (taken prior to a water change)?
It is natural for the water in an aquarium to become more acidic over time. The rate is affected by the hardness of the source water (tap water), objects in the tank (rock or gravel that is calcareous hardens water, wood softens water), fish load, live plants (you have none you mentioned, just noting plants for reference), and your regular maintenance (water changes). I can comment more on how this works once I know the specific pH of the tap and tank waters.
Do not use pH adjusting chemicals in the aquarium. These may or may not work (depending upon the hardness--if you know the hardness numbers for your tap water, this would help; you can get this from your water supply people) and if they don't a fluctuating pH is far more severe on fish than a relatively stable pH. Also, any chemicals going into a tank with live fish are going to impact the biological system to some degree, and these should always be avoided unless essential (medications for instance when absolutely needed).