I am about to start up a 1000 litre tank. Planning on low maintenance with Java, Crypts, Echinodorus and maybe some Moss and low lighting of initially 1wpg. Initially I will not run any COÂ² to see how it fares. I am thinking that maybe with a large tank like this, 50% water changes may not be neccessary? I will eventually stock with Discus and I am reliably informed that 10% water changes will be sufficient once per week in a large tank. So, I am wondering if this will be sufficient for the plants and controlling algae? The problem I have is that a container for 500 litre water change will take up a considerable amount of space in my garage, and wont be easy to heat in the depths of Winter. Would really appreciate some feedback as to what I might get away with.