Tap water is different everywhere you go. My tap water here is terrible, and very hard. I have to use an RO
system to get quality water for the tank. I tried tap in the beginning, but it only led
to diatom break-outs all the time, and higher nitrate levels. It took forever to cycle out the tap, and constant cleanings. After getting the RO
system my tank has become very clear and stable. I am not sure what you have available there, but I know on Ebay they sell them for pretty cheap.