I had caulerpa go assexual on me i think from lack of nutrients as i had an sps only tank that i rarely fed after it used the nutrient up it decided it wasn happy anymore turned white and released tons of spores into my tank very unsightly didn do terrible damage but just the headache of it all chaeto is about low maintanance as you can get this is why i always reccommend it just easier with less maintanace oh and also some caulerpa made its way into display at one point it roots deep almost impossible to get rid of as far as nutrient uptake i have no idea which one is better