Oh the substrate (though hard to see, I'll get a picture tomorrow) is a mixture of a purple-y sand I picked up locally from a place called SIL industrial Minerals (a sandblasting company) and seachem Onyx (which is grain and has a much larger grain size). The mix was accidentally created in a 15g tank I have running, some of the old onyx did not get taken out, and I filled it with the new sand... found out it looks very natural so I went with it (as opposed to that ugly white sand people put in saltwater tanks :P) or black stuff, haha.
Sorry for rambling more.
Cheers,
Chris
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No more tanks  - Laying off the ReefCrack for awhile!
Cheers,
Chris
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