This one is on water changes. I change 30% of my water every five days. I do that as I feel a once a week change is not often enough to get the dirt from the bottom that accumulates. Additionally, I have a total of six racks of tanks in my fish room. If I wipe the inside of all the glass of the tanks on a different row each water change that means in 30 days every tank gets a wipe down.
To remove water I use a self-priming pump and a length of hose that feeds directly into the drainpipe that comes down from my sink before it goes into the wall.
To keep from sucking out valuable fish I fabricated a siphon type of tube from CPVC pipe. As you can see from the picture it is made from very simple parts such as elbows, a tee, caps and some straight pipe. I put the slots in it by loading two saw blades into my hack saw side by side which cut a wide enough slot to feed a sufficient amount of water and yet not too wide to allow guppies to pass through.
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