Hi, everyone, I don't if this has been discussed here. If so, please forgive my duplicated post. Very new to aquarium, and I am planing to make my first water change. Want to know if a water pump is necessary to accomplish that? And which type of water pump is good for a newb? It'd better be easy to set up. Since I am currently livind in Australia, I look up at this store for some water pump. Could you guys take a few minutes to check that and give me some advice for some of them? Thanks in advance.