I use a system like Mike's (only my containers are heptagonal instead of being in a straight line) for the person who watches my tanks when I leave on vacation. It works very well, and is easy to remember as long as you feed the fish every day. Fill up the M, W, and F holders with macros and the T, Th. and Sat. holders with Micros and plop them into the tank when you feed your fish.
Just make sure to explain to anyone who watches your tanks that the "fertilizers" are not fish food. I am thinking about using the same system for fish food since my "tank watcher's" idea of a pinch of food is much greater than mine
