Galvanized Screws in Planted Tank - The Planted Tank Forum
 
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post #1 of 11 (permalink) Old 11-05-2007, 01:17 PM Thread Starter
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Galvanized Screws in Planted Tank

I used some Home Depot Exterior Galvanized Screws to prop up some driftwood in my 90 gallon tank yesterday.

I used a total of 5 galvanized screws.

Could this be detrimental to the health of the tank when/if they start rusting???

Thanks
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post #2 of 11 (permalink) Old 11-05-2007, 01:31 PM
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i'd stay away from them.. They'd either rust or they're coated with zinc.. At high levels zinc can be a problem.

you can either use silicone or gorilla glue to secure things down.


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post #3 of 11 (permalink) Old 11-05-2007, 01:52 PM
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some use thin nylon tie wraps.
I even use nylon velcro tape.
Aluminum wire is water safe.


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post #4 of 11 (permalink) Old 11-05-2007, 02:07 PM Thread Starter
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OK how about Stainless Steel Screws
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post #5 of 11 (permalink) Old 11-05-2007, 02:23 PM
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stainless steel is actually worse than galvanized steel.
we are trying to talk you out of using any screws,
don't you get it?
granted, most LPS mount driftwood on slate with screws,
but most LPS are idiots who's advice we try to undo here.

realistically, if you fill your 90gal with a few large fish,
and low tech plants, such screws won't matter at all.
but if you go with small fish, and especially shrimp,
then sensitive high tech plants, you really don't want
any potential toxins and metals in your tank at all.

think of it another way. if the inhabitants of your tank
ever show signs of distress, and you are trying to
troubleshoot your environment to restore their good
health, the last thing you want to worry about are
the screws you used on your driftwood...


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post #6 of 11 (permalink) Old 11-05-2007, 02:42 PM
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I may have a differing view on this, but I see no reason why stainless steel screws should not be used. In fact, although I have none in use at the moment, I have used them in the past with no ill effects.

In a similar vein, there are a number of here who use regular old staples to affix rhizome plants to driftwood with no ill effects. They simply rust away. Granted there is not much metal mass in staples, but it serves as an illustration.

I expect if you are doing regular water changes, you probably won't see any metal toxicity effects with small amounts of metal.


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post #7 of 11 (permalink) Old 11-05-2007, 02:55 PM Thread Starter
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Quote:
stainless steel is actually worse than galvanized steel.
we are trying to talk you out of using any screws,
don't you get it?
I know that stainless steel is just regular steel with an alloy nickel coating.

Galvanized screws contain zinc.

I'm playing devil's advocate here but don't filter and power head manufacturers use SS and metal magnets that swirl in water as opposed to screws embedded in wood.

Although this does not explain the Zinc issue.

It is what I kept telling myself as I used a power drill to install the screws.
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post #8 of 11 (permalink) Old 11-05-2007, 03:07 PM
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ralph, there are lots of issues like this
where many people get away with it so
there probably is not much of a problem.

many threads go argue over steel, copper,
salt, iodine, carbonate, wood in tank water.

so if you can't find another way to do
what you want, then use screws. but
if you can, with all the alternatives we
have offered, then maybe you should.

as aquaman points out, if you water change
often enough, it's really not even an issue.
but do you really want to depend on water
changes to maintain your tanks health?

I know I don't. which is why I don't over
stock my fish, I avoid potential toxins,
over spec my canister filter and under
feed my tank food and ferts. that way
my tank does not become a toxic waste
dump, should I miss some water changes.


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post #9 of 11 (permalink) Old 11-05-2007, 03:18 PM Thread Starter
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Quote:
ralph, there are lots of issues like this
where many people get away with it so
there probably is not much of a problem.
Point Well taken.

I will probaly get rid of the Galvanized and put in some Stainless.

I am more afraid of the zinc than of a little steel.

I just don't like the use of expoxys and fishing line would be too flimsy for my app.

Thanks
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post #10 of 11 (permalink) Old 11-05-2007, 03:47 PM
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Alright here.

any of you ever used galvinized metals in your tanks over time?
I have.
I wrote an article about it back in 1997.
I used plain old 16 gauge wire to attach plants to cork walls in aquariums by taking 1-2" long pieces of wire and bending them into U shapes to staple the plant rhizomes on to the cork.

Never an issue I had a ton of U staples! Maybe 200-300. They stayed in the tank for 6 years and eventually rusted away.

Zn and Fe are plant nutrients. As long as you do not add soluble Zn at extremely high rates, there is no issue with this.


Regards,
Tom Barr




Regards,
Tom Barr
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post #11 of 11 (permalink) Old 11-05-2007, 04:47 PM Thread Starter
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Thanks plantbrain.

I must admit I have lost touch with the Biology and Chemistry world I once lived in.

Do you think the lead the Chinese are using to manufacture certain filter paints and dyes could have detrimental effects on our fish should the lead become water soluble??? j/k
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