Thanks for the info, that makes sense and I suppose means Pmac is comfortable...or just fat
I usually get a good ventral look at him/her at night before I go to bed as that's the only time it goes on the glass. Last night it's belly was lighter and the usual belly pattern was definitely stretched a bit.
He/she's frequently out on the sand in the evening and I didn't see anything different from that view.
There was a awful lot missing from the carrot piece I put in the tank, so it's certainly possible that Pmac really likes carrots!
Thank you

Racing, shoes and fish. Nothing else matters. Oh, and bacon.