You can palpate whenever you like. Some females will start building follicles before they even see a male. If a male isn't introduced they will absorb the follicles. If you only have one male going to that one female then no, you don't need to put him in every 4 days. Put the male in every couple weeks for 3-4 days and if you see a lock then take him out after they are done. The other schedule I mentioned was if you have a male circling a few females. There isn't a need to overwork your male on one girl.
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Thanks, does the fact they are in enclosures only 18" from another increase the likelihood the male has a "presence" she senses, even though not in the same tank. IE She smells him close, so the produces follicles?