metal contamination in tank

[KevinK]

Originally Posted by medhatreefguy

It's not the Ferrite or Ferritic oxide that I would be most concerned about but the level of Zinc which formed the galvanized coating, here is an short description of the effect of Zinc in a marine tank:

"Zinc:

Zinc is a necessary element for marine organisms. Zinc concentrations of 0.1ppm to 1 ppm cause lowered growth rates in zooxanthellae. A concentration of 0.1 ppm reduces fertilization in the Faviidae family of corals. Natural levels should be maintained, as it is essential for photosynthesis and for the formation of calcium carbonate by corals.

Some crustaceans can regulate the amount of Zinc intake but at high levels this ability is lost, thereby allowing toxic accumulation. As with many heavy metals, the toxicity of Zinc on invertebrates is increased with decreased salinity.

Maintaining natural levels of Zinc is recommended in your system, which can be achieved through regular water changes using a good quality salt mix."

sethis could be interesting (Zinc concentrations of 0.1ppm to 1 ppm cause lowered growth rates in zooxanthellae) as I have some corals that did not do anything.

I know when I worked with bolds last year, and the growth reduction could be with 2 months tollarance related to this.

as the bolt is out now, and I'm inproving maintanance, I do se improvements.

[hillegom]

Are you sure the bolt was galvanized? Or was it shiney? As in cadmium plating

[KevinK]

Originally Posted by hillegom

Are you sure the bolt was galvanized? Or was it shiney? As in cadmium plating

galvanised, as I never both the plated once, always galvanised.

i know it must have bin a year ago, becouse my filter room is right naxt to the front door, and I made a deck in the front a year ago

I must hd my door open to the filter room when working on the deck, and the little bugger went to explore.

again out of interest, and gust to learn, what would be the effect on the metals based on cadmium plating ?

[hillegom]

I don't know what would happen if the cadmium was dissolved in the salt water. I do know if you weld it, cadmium is very toxic to our health.