Finally did first water change in the weekend... brought all the bits, and found my kitchen sink didn't fit it... ugh! used the stresscoat in tank/Hose directly into the tank method, monitored the temps, didn't change from 24.... found out some really cool stuff re: emperor tetras... from wiki: "However, with the addition of fresh cool water, a large group of emperors will school across an aquarium, sometimes for several minutes." The little guys go crazy over the cool water from the hose, took about 30 mins to top up the tank... school of them.... would all line up to the white water... and throw themselves into it, had them getting flung around, some a few inchs out of the water... they would school around the heater... before going in for another round..... other tetras in the tank.... didn't want anything to do with the hose...emperor tetras... keep doing this for almost 30 mins! I will make a video of them next water change... Love your tank JasonNZ, good luck selling it, looks like an awesome setup! just crazy big! Am pretty happy with the water change.... is actually easyer than when I used buckets with my old 215l, don't think I need to do anything fancy just yet.....until I get a bigger house/bigger tank.... -Chris