If your question, is would that be sufficent to keep a clam under.
I would say you are good to go for a Squamosa, Derasa, Maxima, pretty much any of them. Your biggest problem will be size as they grow. A Squamosa for instance will get big fast as will a Derasa.
If I were you I would give a Squamosa a try first to see if you have any problems. IMO&E they are typically the easiest to take care of.