well i use a 1/2 inch clear hose that i got from home-depot about a dollar a foot. i hooked it up to the drain on my fx5. To do a water change all i do is flip a switch and open the valve, about 10 or 15 min later i just unhook it and feed the water straight to the tank from external hose conection. once im done ill add a few drops of stress coat from API and done. i have never had spikes or problems been doing it for years and water stays clear id say just do that. carrying buckets is way to much work for a simple water change. i have found the easier it is to do them the more on top of it i stay if i had to change 15 or 20 buckets a week id reconsider keeping fish at all lol not really but its alot of work