for some reason there's an oily film on the surface of the water in my RES's tank. i even tried doing a complete water change and cleaning the whole tank with really dilute bleach and rinsing it really really well then also changing the filter cartridge. my turt still is happy and eating and moving about, so it doesn't seem to be harmful to him. but has anyone encountered this? i don't want it to become a problem! thanks!
Debby and Sesame



