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Bat Guano

>I just put fish into a new "low tech" tank that I set up using potting soil,
>and cuttings from my "high tech" tank.  I then read the bag the soil came in,
>and it is all organic, including the bat guano and chopped worms.  Anyone had
>luck with bat guano and the like in their substrate?  I don't like killing

I don't know about killing fish, but Diana Walstead recommends against soil 
substrates enriched with earthworm castings (worm guano, not cut up 
worms).  From memory only - her reason was that such rich soil fosters 
algae, not that it's harmful to fish health.

Ellen O'Connell
Parker, CO
mailto:oconnel4 at ix_netcom.com