What's with all the spawning?.I was lucky to catch my 10 inch squamosa a week ago.Was doing my morning check and noticed the 180 gal tank was cloudy...turned on the lights and the big clam was spewing...quickly went to Google and found this article.
http://www.advancedaquarist.com/2009/8/inverts
This helped me alot...I think I would have lost everything as the tank got more and more milky...thought the clam was done when it started again. I had a 25 gal quarantine set up so put the clam in there where it finished it's thing in another half hour.The stuff in the quarantine was like silt.
In the 180 I added air pumps and changed out my filter pads frequently..also had some poly filter pads ..added extra bags of carbon..and did a 20 gal water change.Everything is good in the tank...the skimmer has been working overtime and the pads are very dirty.The ammonia is 0.
The clam was not so lucky....ammonia up to .5,cloudy water then stopped reacting...and started to stink up the house.Deceased.
Good luck.