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Please Help ! I have a 29 gal tank. Bought used...Washed Tank plus filter system and hoses ( Fluval 304) replaced with new foam,carbon,ammonia chips, bought new gravel, have 4 plastics plants, one bubble sculpture, one heater, one temperature Gage...Problem....I have well water and PH from my sink reads low...I add water to tank and within one day PH reading is 7.6 ....can do a 10% water change and it will come down some....by next day it is back up to 7.6...This is before any fish are added....Tank has been set up for 2 weeks now.... any suggestions on what might be causing my PH to be high ? If this was a salt water tank before , Would that cause my problem ?