the marmokrebs should do well for your..
i've got several hundred at the moment, and they handle a good range of temps.. mine haven't been above 80, but from what i've read, they can handle it..
from my first "hatch" i left several in multiple glass tanks, and have been feeding a dozen or two to the pool every week or so
i've put close to 40 larger ones into the pool, several of those were berried..it took a while to get to that point, but now it's pretty steady..
i use sponge filters in all my glass tanks so the baby marms don't get sucked into a filter
i'm really thinking hard about getting some gsh this weekend, feed all my rosy reds to the pool, and use the single tote for the gsh..
