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Re: Rocks for the aquarium

Daphne wrote:
"I have
been considering adding some slate to my tank.  I haven't already since you
couldn't see it though the green water!!  Anyway, it is black slate with
deposits of rust-red in places. You can rub it off with your finger.  The
"deposits"  grow in the aquarium and easily crumble into a mess if you rub
across them in the water.  It is obviously not toxic due to the fact that I
used some of this slate for years in African cichlid tanks and it affected
neither them nor their fry.  You do not want to let it rest against glass
though, it won't come off glass if it rests against it for any length of

Where did the slate come from? If you can pin it down to a location, you
should be able to find out more about what minerals it might contain on the
web. For example, a few years ago, I was considering using some local rocks
and soil in a couple of tanks - I discovered that a local University has a
whole web site dedicated to local geology and geography, with very detailed
maps of what is likely to be encountered around here. It helped me a lot in
looking for suitable materials.

A bit of searching can turn up some very interesting information sometimes.

James Purchase