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It is possible he is a male and has just one thing on his mind, finding a female.
Could you post a photo showing his front legs and pedipalps so we can try to tell you his sex?
I'd give him a nudge to get him swimming, it seems to be the movement that brings the poop. If he hasn't done one in the bath be careful as you take him out as he may well do it over you. :D
A good sign of an oncoming poop is the tail up in the air.
I found 5 moults during feeding today, all have happened in the last 7-10 days.
Brachypelma albiceps, Cholula. this one must have just moulted in the last 24 hours judging by the still ghostly legs. It definitely needs a bigger home now.
Phormingochilus sp. Rufus, Java, was to shy for...
Warm water is usually enough, not too warm though.
Using the bath is ok as long as you rinse it out well with hot water first. Some of my big Boas used to love going in the bath.