As the title asks, how do you know your tank is ready for a clam? I have stabilized my temperature at 79*F. My salinity has been steady at 1.023. My calcium and alkalinity and trace are being added by a calcium reactor that I have dialed in accurately. I have a decent skimmer that is keeping the tank clean and I have some SPS frags that are doing decently. I only feed my fish flake,... soon to switch to frozen foods. When do you think it's ok to add a clam? How big of a clam should I add to the tank? What kind of clam can I add? How much phytoplankton and how often should I feed a 75g tank?