I have read 90% of all of the "big" books, and none of them mention the different things that can happen using different substrate. For instance, I have used aspen, but I get black mold under the water bowls almost immediately, but others have no problems. You could mention why some substrates work for some people and not others. My guess is because I don't put enough aspen in my bin as opposed to others who put a lot, and they don't get the mold. I don't know if this is so, but it is just a guess, and would LOVE to be able to read a book that tells reasons why different substrates work for different people. I tried using cypress mulch, and I got that spider-web looking mold where my balls defecate. Also, I have noticed that the balls in my "deep" rack eat better than the ones in the horizontal type, and I think that has a lot to due with too much light for them to feel secure. Little things like these drive hobbyists nuts, so, just something to think about.

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