Need Clam Recommendations

[Albertan22]

Water quality readings as of this afternoon:
Ammonia: 0.25
Nitrate: 0
Kh: 7
Calcium: 440
Phosphate: 0 (undetectable)

I hadn't run any tests for 6 weeks or so and didn't realize that I had ammonia in my tank. I'm guessing that the tank hasn't stabilized since I added a group of three anthias about a month ago. I usually only add one fish at a time, but I thought it best to keep the group of anthias together. The ammonia reading is pretty low, but I'm guessing that I should wait for the ammonia to drop to 0 again before adding a clam?