Ok parameters seem to have been fine, I'll check again tomorrow. Calcium has been high and salinity a little low, but again I'll check tomorrow. And the clam may not be "looking to good" becuase I had to dig through the rockwork to get my dead shrimp before my nitrates spiked, and I took off the lights to clean off the salt so the lights were just added, and the goby has been hanging with the clam some. Just things to consider. I'll do tests tomorrow, and do a top off with some sw from the 20g if my guess is right and the salinity is still low.