Thanks John, I thought the calcium may be a problem.
  I'll coat a few with a few coats of spar varnish; I've had some rocks that I coated with it in my tanks, for quite a while... because they are limestone.  :-)>>>
  
  Al.
  
  --- In AquaticLife@yahoogroups.com, SIMMONDS JOHN <simmonds.john@...> wrote:
  >
  > Hi Al,
  > 
  >   Yes, I think it is dangerous using anything that is naturally harvested
  > because there could be something nasty perhaps bacteria or spores etc even
  > harsh washing would not get rid of. You are also going to cause problems
  > with your pH because shells are calcium, however I think coating them in
  > inert varnish woudl be fine as long as you are certain the varnish is
  > completely harmless to your system.
  > 
  >   John<o)))<
  > 
  > 
  > On 30 March 2013 20:15, Al Keep <al_keep_fish@...> wrote:
  > 
  > > **
  > >
  > >
  > > Hi all.
  > >
  > > My pastor just came back from a holiday in Myrtle beach, and he bought a
  > > package of shells for my tanks.
  > > I think it's nice that he thought of me, but I believe that I've read
  > > that's a no no, due to them messing up the P.H. as they decay.
  > > Am I right in thinking that? If so, then I can coat a few in varnish
  > > first... that way I can say I used them. :-)>>>
  > >
  > > Thanks.
  > >
  > > Al.
  > >
  > >  
  > >
  > 
  > 
  > [Non-text portions of this message have been removed]
  >
  
  
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