Dragging this one up out of the depths again. Better than starting a new thread on the same subject though.
How can you tell if the tank has already been exposed to copper treatments?
I have a 29g tank that I was going to convert to a frag tank with a new 20L sump. I've heard somebody say once that the silicone would turn blue if it was used for copper. My tank looks pretty normal, but I am a little paranoid because the silicone does look like it might have the faintest tinge of blue stain. It's still very plainly clear silicone and you can see through it very easily. But my eye tells me there is just a hint of blue in that silicone.
So the 64 dollar question is:
How dark of a blue stain are we talking about?
I'm probably going to go through the procedure anyway, but would still like to know just how stained we are talking about. Would be nice information for myself and other newbs trying to work with free equipment. I'm poor as a church mouse.
Edit:
I went back and read the directions again for copper tank clean-up. It keeps using the word "wash" So does that mean we simply wash the tank and rinse? Or does that mean we fill it to the top and let it soak?
How long should I leave the bleach solution in the tank? 10 minute wash? Overnight? 30 minutes? Couple hours?
And the vinegar clean-up? 10 minute wash? overnight? Couple hours?
Thanks