yellowing leaves dropping off is too much water, not enough light combined with less than desirable humidity. (a less than scientific evaluation). some might think watering would take up the slack for humidity but it doesnt IMO. you should keep the roots wet and evenly moist but you should also give them brighter light and more fresh air.otherwise the leaves cant use what the roots are pumping into them.
cool intermediate or warm... mine dont seem to matter much what the temp is between 55 and 85. they love light and fresh air. Some I have found will not bloom unless almost full morning sun is given during spiking.
maui lollipops have not done well for me I must admit..
celtic frost maybe akin to angel frost have never done well for me either but what Do I know..they die I go buy something else that dont
I havent killed a masdy in a very long time..shut my mouth!!!
I think more light more air will cure your woes.