Hi Keith, temps of 80's not bad, but I have seen them thrive better on much warmer temps . But since the one you have is not the full green type, I would consider growing it outdoors, but in part shade. There is more interaction outdoors for these plants. Observe and leave it alone on one spot. I would consider putting some top dressing to keep the roots cooled..like more pumice or chicken grit, so the base is not sitting too much on the soil.
The softening base is often a sign it is suffering over watering, so try to keep dry, but bring it outdoors in part shade so it can get more air circulation and warmth around it. Maybe try to find a spot where it will get morning sun.
Sometimes we get too engrossed with watering, but forget about air circulation. So try to make a good balance for it, let it enjoy the outdoors in part shade.
