When it comes to water changes in smaller tanks it can be kind of a pain for me. I shut down the system completely except for lighting, syphon out 15 or 20 gallons, bring over the 5 gallon jugs that have had a heater in them overnight and slowly pour the water back into to sump, bottle by bottle right after turning the main pump back on. Isn't there an easier way? I read how large tanks just open a valve, I assume on the return line from the tank and another valve from a source of fresh water. Is that the full story or am I missing something?