Don’t they need at least 215 or something to even be considered a quorum?
Apparently they need at least a majority to conduct business. One of many references I found:
http://congressionalresearch.com/98-988/document.php
The Constitution requires that a quorum, or a simple majority of the Members,
is to be present on the floor when the House of Representatives transacts business.
However, the House conducts much of its legislative business in Committee of the
Whole where this constitutional requirement does not apply. Also, the House always
presumes that a quorum is present unless and until its absence is demonstrated
conclusively.
The rules of the House severely limit the occasions on which a Representative
may make a point of order that a quorum is not present, either in the House or in
Committee of the Whole. In current practice, Members usually make such a point of
order only when a vote is taking place. If a majority of the Members fail to respond
to a quorum call or participate in an electronically recorded vote conducted in the
House, the House must adjourn or take steps necessary to secure the attendance of
enough Members to constitute a quorum.