09-25-2012, 10:00 AM
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Originally Posted by Quantum
the black sand blasting media is coal slag, which is mostly silicon dioxide (but not SiO2 quartz as is most play sand - same chemically, but with different crystalline structure) and aluminum oxide, it is also some percentage of CaO, which will affect pH (raise it)
also consider that it is used as sand blasting media because of its texture (hard and sharp) so not ideal for any substrate fish
Much depend's on grain size with the blasting media.
20/40 Black diamond blasting media has had no ill effect's on water parameter's,or the eight Melanistius corydora's and hundred's of cherry shrimp in the eight month's I have been using it.
Bristlenose pleco's love to dig it up is my only complaint.
Lot's of folk's using this media with cory's, loaches, but opinion's and real expieriences are two different thing's to me ,so I decided to try it.
Am pleased thus far.
I have fairly hard water from the tap and although this product contain's calcium,iron,magnesium,I have seen no bump in pH or hardness which would not suit the cardinal tetra's and rummy nose who occupy the tank's with this media.(believe the plant's could have,or are,, utilizing the mineral content).