I've gotten where if I'm not sure a plant I wanted and bought will survive? I take a few small cuttings or strands in the case of moss and put them in jars or my 2 gallon metaframe. Sure enough two species of plants that died in my 240,are now back with my better skills a second time around and doing well. I even have Hydrocotyle tripartita in the 2 gallon in potting soil and its soon going to fill it up with enough for a second try and even maybe trade at the LFS.
So,if you have the room and don't want to lose all a plant...keep some in reserve.
So,if you have the room and don't want to lose all a plant...keep some in reserve.