I've had moss balls. Very painful. My suggestion would be to use
soap - daily. And remember - it's not a real bad problem unless
they're blue.

Yeah but this is a huge problem cause this guy's moss balls are
GREEN!!!!!.....
To the OP, I have these in 2 tanks, one high light and one low light, they
seem to thrive equally well in both tanks, if one starts to break up then
just take it in your hand and use it as a stress ball. Give it some shape
and put it back, it should retain its shape. Those tiny bits that break off
will form new balls, albeit SLOWLY.
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**So long, and thanks for all the fish!**