slag as substrate - The Planted Tank Forum
 
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post #1 of 9 (permalink) Old 02-04-2011, 02:19 AM Thread Starter
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slag as substrate

would coal slag be a good substrate?
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post #2 of 9 (permalink) Old 02-04-2011, 02:51 AM
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Not too sure why you would want to use coal slag as a substrate...

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post #3 of 9 (permalink) Old 02-04-2011, 02:52 AM
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I've used sand blasting grit that was coal slag with good results. It works fine as a cap for MTS or even raw topsoil but the potting mixes have too much decomposition and burst out of it.
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post #4 of 9 (permalink) Old 02-04-2011, 02:55 AM
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very mixed opinions. from what i have seen and heard. most seem to agree that plants will grow well, but it is very sharp and can tear up fish and also scratch tanks. there are also questions as to what may leach from it long term.
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post #5 of 9 (permalink) Old 02-04-2011, 03:02 AM Thread Starter
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the stuff i looked at was very fine and i wanted black substrate. here's the bad part. my lfs does not carry any. the nearest store that does is nearly 70 miles from here and that slag is the only black media i can find short of using gravel or topsoil.
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post #6 of 9 (permalink) Old 02-04-2011, 03:10 AM Thread Starter
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the stuff i looked at is less coarse than silica sand. i use that in several of my other tanks. i am wondering if it would hurt my turtles though. that bag would be enough to do my planted tank ad turtle tank at the same time.
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post #7 of 9 (permalink) Old 02-04-2011, 03:16 AM
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I've read some reports that autopsies were done on dead fish that found sharp pieces and ruptured organs inside. I've personally shyed clear of this stuff based on those reports.





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post #8 of 9 (permalink) Old 02-04-2011, 03:19 AM Thread Starter
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good to know. i might just have to break down and spend the 20 bucks a bag for the stuff i looked at at the lfs. it looks like argonite except its black and smaller than aquarium gravel.
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post #9 of 9 (permalink) Old 02-04-2011, 04:37 AM
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I wouldnt recommend anything remotely sharp as some fish like to roll the bottom when looking for food, and i dont mean roll as in ammonia spike but it looks a bit similar only slower to dislodge fallen food so they can eat it. Also catfish and other bottom feeders would probably eat some of it on accident.
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