You might want to share the placement of your tank.
Also, In my experience I'm able to keep leather corals without chiller.
But considering now I've chiller in my tank, leather do alot better with chiller and faster growth.
So yes, you might be able to do so depending where you place your tank and what is the room temperature.
Do note because you do not have chiller, equipment in your tank also produce heat thus might increase the temperature.
My dream is to have a marine tank with marine critters and softies only. Considering that Softies are thought to be more forgiving to parameters, do I really need to have a chiller for my tank?
Still planning so have to think of the equipment I need to cater for.
I recently introduced a nice big Prata Coral (acanthophyllia or meat coral)... after a few days my Koran angel took a small bite at it (it is totally my mistake and now I separated them) and some of its bony skeleton can be seen when it shrunk. The prata looks ok still eating and expending and shrinking as usual. Are there any suggestions from the experts in this forum to help my prata to heal and recover? Thank you very much.