I'm reclaiming sand that is approx 5 years old.....it turns out that the mice had a mini-condo complex carved out of it. After rinsing for what seemed hours I put it into a new holding tank to cycle with some new rock. I then added a some sand, water, and rock from an established tank to start the process. Even with the rinsing the ammonia has spiked almost off the scale and nitrites are pretty high as well (this is after only 2 days). I think the problem is with solid waste. The color and texture of the sand made it difficult to clean solids out. At least with nitrites this quickley it shows that there was some benefit from the addition of the sand/water/rock from the established tank.
Now the question: After cycling is this sand still good to use or have the mice contaminated it too badly? I have two good sized buckets that are destined for a 75gal tall with a 2 to 3 inch layer. I really don't want to have buy new sand.
-Gregory