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If you can find it,there was a study done by Jose Gonzalez Liboy (2005)on the Caribbean grass Thalassia,t.It has just the info Your looking for.
From the study....41% is sand,17.5% silt,32% clay with small amounts of quarts.In an other study they found that there was 80% calciumcarbonate,~18% mag-calcite,~2% nutrient rich mud/soil.
The only thing I see,that might be problem,is that if you put too much nutrient rich material in the substrate it can,and most likely,will go anoxic and kill the grass.
One other thing,most seagrass beds tend to become more richer in nutrients over time.So if you start out with a very rich environment,then it can become eutrophic in a short period of time.
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Seagrass,Mother nature's way of organic carbon dosing.
"Nitrification is controlled primarily by 02 and nitrogen as ammonium supply,
while denitrification is controlled by nitrate and organic carbon supply" Seagrasses 2006
Life on earth depends on plants-without plants,no life.Alf Jacob Nilsen
Current Tank Info: 125 DT,135 grass fuge/sump;75g seagrass/seahorse tank 70 fuge/sump
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