Hi Al! How nice of your pastor to think of you like that. :-)
I think I would be a little concerned using varnish on anything going into a fish tank. Initially they may be safe, but what about once they have been scrubbed/scraped up a bit from cleaning? Disturbing the varnish may not be such a safe thing, and I'm thinking along the lines of chemical reactions and gases that can be emitted once something like a varnish surface seal is broken/damaged. Also any fish such as plecos that will scrape on it as they feed from it...
Also, since I don't know what kind of shells these are, I'll just make mention... I would avoid any spiral shaped shells. If you've ever seen a broken one on the beach anywhere, or even from the bags of them you can find at craft stores, you can see how deep the spiral runs. Trying to seal that with varnish effectively would be quite difficult, but you'd have no way to know for sure if you reached the depths of the shell or not.
There are various aquarium sealants out there on the market and I am pretty sure 2 part epoxy is also safe but will have to double check on that one before I suggest it. Or, what about a thin glaze of aquarium silicone? Then if/when you ever decide to remove the shells from the tank you can easily peel it off to restore them to their natural form. It would be a little messy to do, but not any worse than varnish, and at least you'd know for sure it's safe.
Watch your pH carefully after you put this stuff in the tank just to be sure your fix it methods are working without any adverse side effects.
Post us some photos when your done if you can please? I would love to see how it turns out. :-) Have fun with your shells!
Dawn
--- In AquaticLife@yahoogroups.com, "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.
>
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