Consider using cell permeant fluorescent indicators with emission wavelengths greater than 570 nm. Orange calcium indicators such as Cal-590 AM (Cat# 20510) and Calbryte 590 AM (Cat# 20700) have excitation and emission wavelengths equal to 570 nm and 590 nm, respectively. Red calcium indicators such as Cal-630 AM (Cat# 20510) and Calbryte 630 AM (Cat# 20700) have excitation and emission wavelengths equal to 608 nm and 626 nm, respectively.