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Plastic leachables should be inert for the most part in saltwater (there is always an exception). Metal leaching is not the same case. Once again this is just my two cents.
I would use pvc and egg crate if your trying to make up something for low cost
I would personally not use it. People have metal magnets crash systems from plastic coated magnets. As that item is from the dollar store, I would say that the quality control for the plastic coating is probably not there.
With that said, just remember how corrosive salt water is. I would not...
from seeing this in person I don't believe its in the montipora family (unless the polyps are microscopic). Smooth skin and no polyp extension that i ever saw from it.
I always felt like it was an extremely uncommon species of coralline algae, except that it grows nodules, most of the rarer...
Females look like the have a six pack with a rounded latch. Males have a pointed latch.
almost universally the underside of a crab is more rounded for females and pointed for males