Complex sentence: They grow up 2.5 cm in size and live in temperatures up to 27 ° C (80.6 ° F), surviving best at 20--25 ° C (68--77 ° F) with a pH level of 6.5--7.2.
Split into simpler sentences: They grow up to 2.5 cm in size and live in temperatures up to 27 ° C (80.6 ° F). They survive best at 20--25 ° C (68--77 ° F) and at a pH level of 6.5--7.2.