goldfish are obeise? i finally got them the right filter so that was a good idea, and i also have a pump cleaner which helps alot should i start over and get a brandnew fish tank, cause in the beginning i would change there water all the whole fish tank and they would be happy now everytime i clean the tank with a 75% water change they start to get stressed, and i am using the correct ph balance tabs, using my thermometer, i dont understand whats going on i even use the ph test strips??