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I'm interested in the cryptic results. I unknowingly ended up with a cryptic filter when I discovered that one of my 55 gallon drums that I use as a sump for no other purpose but to add water volume to the system needed cleaning out. The water at the bottom had that ole sulfur smell. (the water entered at the top and exited the oposite top) I freaked out and drained the whole thing and then put in an air stone to circulate the water better. Since the addition of the airstone I have been fighting nitrates. I have it under control with pellets now but I am always thinking of pulling the airstone and letting it go back. I could keep my nitrates much lower when it was cryptic.
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