What kind of lighting are you using right now on your current tank?
*edit* Just seen in a previous post that you're using PC's on the 20g. Not sure what your plan is, but PC's will most definitely not be sufficient for either maxima or crocea clams. Metal halides is a must for these creatures!
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20g BB Mixed Reef // Coralife 150w HQI // AquaC Nano // Koralia 1 & Seio 820 // Jager 200w // AC50
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