Tank has been running since mid September. Had minimal cycle with Marshal Island rock, went through a couple algae blooms, all water parameters are good and stable. The clam is 3-3.5 inches long under 250 W MH light in a shallow 20 gallon long.
It may have been a little soon and time will tell. Seems to be doing well (although only since Dec 17th). The clam has great mantle extension, no gaping and quick response to shadows etc..
Stable parameters: Temp 81
Salinity 1.026
pH 8.2 (night) 8.3-8.4 (day)
Ca 425ppm
Alk 10 dKH
Mg 1400ppm
NH4 0.0ppm
Nitrite 0.0ppm
Nitrate undetectable
Phosphate < 0.05ppm