I have 3 tanks. 2x10g and a 30g. They all decorated with rocks and planted. The rocks were all tested with vinegar. Out tap water have a ph of 9-10.when in the aquarium it settles down to 7.2-7.3. That is in all but the one 10g tank. In that tank it stays at 8.2. What am I missing. Why won't the ph in that one tank drop? It only homes a Betta thatbis ok with that ph range, but I'm just confused as to why the ph won't settle like in the other tanks. These are the tanks in question. The one with the ph problems is the 2nd picture
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