This time of year is great for Diamonds....however in the middle of summer thats a different story, to over come the heat problem is that I use a poly box (Broccoli box) with spag moss (about 3-4 inches deep) kept moist, you can cut the temps down quiet alot. Also I use a large tub for water as they will bath during hot days...doing all that (which isnt much really) the Diamond live and breed very well.
Marc