well i have tryed changing 60% of the water 5 times a week, yet the fry grew no faster than normal which for me is 19 to 20 weeks till adulthood,and i always feed my fry a liquid fry food and copapods ones a day.
unfortunantly i do not have a pic, but i'll git a pic of a normal DT and try to make it look like the rhino, so you can get a better idea of what it looked like.