Having a 55g almost a year, I do my water changes every 3 days approx. and I have yet to use a heater and powerhead when mixing my salt. I mix it everything up 24 hours ahead of time, every few hours I mix the water myself and before I put the water in, I add hot water to bring the temp up and to also get a correct reading on salinity. Never had a problem yet, so maybe this will some out there who are looking to cut some costs down. Personally, I just have a problem buying all this extra equipment when I can use a little elbow grease.