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Looking to set up at 90-125 gallon reef system. Been reading that play sand is ok (on this site) and others say that Southdown is better for the looks. But when I read about substrate in The Complete Marine Auquarist, they say that the play sand is not good as it does have slicia and does not have the calcium buffers that the traditional substrate has. Its a little confusing. I have a trip to Panama City over the holidays and I was thinking about bring some of the very white sand back from theGulf Coast. Its looks like sugar was wondering it might the right thing to do. Thoughts? Its very fine grains but very cool looking.