Moss ball is partially brown

do you ever move them around? in the wild they are moved by currents so they get sun on all sides. it's recommended to turn them over periodically to expose all sides to light.

If you're squeezing, it's probably the light that's the issue. Just make sure you turn it over every once in a while. I don't know how often you do water changes, but it might be easy to remember to just flip it about 160 degrees after every change. Not full 180, because then you're continuously only getting two sides in the sun, but just a bit shy of a full flip every time.

Thanks! For the endlers there was no thought involved. Just whatever name came to mind when I saw them swim by. q=