I've run a skimmer 24/7 on my tank for the last 7 years and my bubble is about the size of a basketball with my toadstool even bigger. I don't target feed them either. 
My bubble has more than trippled in size since getting him and has even spawned once in my tank as well as repaired tears in his flesh a few times. Just and FYI.
I use NSW and have seen an increase in my corals size and "happiness" over the years since I switched.

My bubble has more than trippled in size since getting him and has even spawned once in my tank as well as repaired tears in his flesh a few times. Just and FYI.

I use NSW and have seen an increase in my corals size and "happiness" over the years since I switched.