Black Diamond (coal slag) is it safe?

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bulldovii

Jack Dempsey
MFK Member
Sep 30, 2012
721
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Fairfield, Illinois
I'm trying to find out if this stuff is safe. Anybody used it long term. Any unexplained fish deaths or unexplained anomalies in their black diamond tank.

This stuff is ridiculously cheap and just want to make sure there are no problems with it before me or anybody else takes the plunge.

There's a lot of pics and people using it but not a lot in the way of convincing me of its safety.

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Ive had it in two tanks for a while only problem ive had is in my 55 the fine gets stirred up and gets in my filters

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It is supposedly inert. It better be safe, because I just started a tank cycling with 150lbs of 20-40 grit black diamond.

It looks great so far, insanely cheap, beautiful sparkly glassy black.

Make sure you wash it well.

Coal slag is a glassy substance left over in the bottom of the furnace after coal is burnt. The heavy metals, etc that are in coal are gone.
 
I have been debating on using the same stuff in my tanks. I had heard it was bad for aquariums but then hear it is just fine. I am looking to use it in a 40b and a 55. I am considering building a 400+ gallon this summer (and an "office" room it will be in) in my house and if I do I would consider using it in there too if or when the time comes.
 
As far as altering the chemistry of the water or leaching something, it's safe.

However, I bought a few bags, don't remember what grit, that contained a lot of glass like slivers. It seemed like each time I rinsed a bucket or had to replant something that had been dug up I would end up pulling 2 or 3 slivers out of my hand. Used it in a couple of different tanks for about 6 months, never had any deaths, everybody was happy. I just figured it a fish ever swallowed one of those, it wouldn't turn out so well.
 
zukiGS500 said:
As far as altering the chemistry of the water or leaching something, it's safe.

However, I bought a few bags, don't remember what grit, that contained a lot of glass like slivers. It seemed like each time I rinsed a bucket or had to replant something that had been dug up I would end up pulling 2 or 3 slivers out of my hand. Used it in a couple of different tanks for about 6 months, never had any deaths, everybody was happy. I just figured it a fish ever swallowed one of those, it wouldn't turn out so well.
Click to expand...

These are the things I'm talking about.

Does anyone have plecos? I have read on a few other sites that it's not good for them.

Has anyone ever used it for a year or more . I'm afraid of long term effects. A lot of fish can put up with sub-optimal conditions short term.
I'm just trying to bring up some points to look at.
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