Sounds good to me. I have got the fine salt pellets/crystals. I got them at the local feed store. The most common mix is 1 part cememnt to 3 parts other stuff. It stays pretty fragile for about 1-2 weeks until the concrete starts to cure. The stuff I made last year broke apart for a week or so then it was and has been fine.
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150 G mixed reef. 
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