hey just an american putting my 2 cents in but i read a while ago that leaving daddy in is good for several reasons,, less ending fry even a small batch usually ends up with 25 or more,,really what are ya gonna do with 300 fry? daddy eats the weak and sickly ones so the ones that are left are strong and top quality,, and daddy teaches them to swim and eat,, i even have a betta book that someone was experimenting with leaving daddy and mommy in ,,peremently,while raising multible batches of fry,,,, think huge tnak 55 gallon planted really well, jusst removing older fry at about 2 months,, so they dont compete with mom and dad for breeding reasons,and how its more natural. in the wild daddy bubbles the babies and mommy stands guard from a distance, i think first times have such a hard time with eggs fry and as adults aggression, cause they have no ;; family time;;