My bristlenose plecos spawned a week or two ago, and i have fry. they are probably 5-8 days hatched, and their yolks are all gone. but the dad will not let any of them out of the crevice in the driftwood where they were laid. how do i convince the dad to move on? i tried poking him out with a piece of blanched zuc that was in the tank and being eaten on. but he wouldn't budge