A sad day. That beautiful maxima clam photographed on 11/5/09 on page 14 of this thread just died. I noticed its mantle had severely retracted a few days ago. Last night, I got home and noticed there was almost no mantle visible, and the shell was gaping. There was also slime coming out of the top of the shell. I took the clam out of the water, and it smelled rotten, with the area where the foot should have been wide open.
Everything else seems to be doing well, and I haven't made major changes to the tank except for adding the frags mentioned above a week ago, which I dipped in Flatworm Exit (with a powerhead) for about 45 minutes, and dipped in Revive for about 5 minutes (basting, and looking carefully for bad hitch-hikers).
Except this week I did find a couple of acro frags that had tissue death. When I pulled them out of the water, I noticed a few small invertebrates. They didn't look like AEFW (which are fatter and more transparent), at least after searching for photos and discovering the page on Melevsreef. They were reddish brown, elongated and very tiny, and moved surprisingly quickly. They did not look like copepods. I had to dispose of the dying acro frags, and didn't have time to take a photo of the miniature pests.
Any reef veterans have any idea what might have happened to the maxima clam (bacterial infection) or acros?