The best buy I ever made. (For healthy water changes)
I always hated doing water changes, then my tanks went nuclear with nitrates. On top of that I decided to get fancy guppies and many of my snails and shrimp died off. I was not happy, game on!
Best buy was a small pond/fountain pump and enough tube to reach my sinks. Water changes and vacuuming has never been easier. I feel so ignorant that I didn't come up with it before. One normal siphon for the tank leading into the pump intake and a longer hose to expel (and eventually to hook onto the sink for direct refill) and no more is my laziness an issue.
Shrimp and snail junkie... What can I say, I like the little things in life.