I have always fed my tank. Depending on how long you go back everything from strained V-8 juice and whirled raw seafood (late 1987) to what I am using now.

In my 6g at home as well as in the store I use a mixture of:

Fritz Invertebrate Banquet
Liquid Life Bio-Plankton

These two seem to work well for me. I fed the Fritz product mixed with DTs from day one, and changed to the current mix on May 4.

I know people who use the Kent products and feel they work well for them. I personally like the Fritz one, and have fed it for years.

Charley