Yay or Nay? Coal Slag for substrate Question

  1. April R

    April R Well Known Member Member


    So I was thinking of using this to cap my dirted tank. It is my 20 gallon guppy/cory heavily planted tank and I have been battling a losing war with cloudy water from the Miracle Grow coming up through the current cap of Onyx Sand because of my stinking cories turning it up all the time :p Silly cute buggers.

    My major issue is that my filters are getting hopelessly clogged with dirt, and I am tired of changing out the pads every other day with no change in the cloudiness of my water, even after major water changes of up to 75%.

    If anyone has had experience with using coal slag in a planted tank please please please help!! Thanks :;toast
  2. Marie1

    Marie1 Well Known Member Member

    I've never used it. The only issue I could see with it is it may be too sharp for the cory. But having never used or even seen it, I can't say for sure.
  3. Coradee

    Coradee Moderator Moderator Member

    I have heard of a product called Black diamond blasting sand & some people have used the 20-30 grain size for corys with no ill effects.
    I don't know if that link you gave is a similar product, you could ask if they'd send you a sample to see whether it's sharp or not.

  4. OP
    April R

    April R Well Known Member Member

    great idea!
  5. g

    guppyguy76 Valued Member Member

    Interesting.....I didn't know anything of a by product of coal would be suitable for aquariums. I live in PA and I have seen the toxic orange runoff in streams because of coal mining here north and west of where I live. My family is from the coal region originally.
  6. Thunder_o_b

    Thunder_o_b Fishlore VIP Member

    I would not trust anything that was the by-product of the mining process
  7. Marie1

    Marie1 Well Known Member Member

    It's inert. It's used for sand blasting.
  8. Thunder_o_b

    Thunder_o_b Fishlore VIP Member

  9. Marie1

    Marie1 Well Known Member Member

  10. Matt B

    Matt B Well Known Member Member

    As far as blasting media with bottom dwellers I hatched and grew out a group of Sterbais (30-40 individuals) in a tank with black diamond as the substrate. No ill effects were noticed aside from a rather low die off of about 10-15% and they lived on it literally from the time they were born to about 3-4 months when I moved them out. they are adults now and seem perfectly normal to me.

    If it didn't bother their yolk sacs just after hatching I really have a hard time imagining a fish hurting themselves on it.
  11. OP
    April R

    April R Well Known Member Member

    thanks for the discussion and linked articles guys! I am definitely going to save up and get some, then re-scape my 20 gallon. It is long due anyway.