You will get mixed replies on this.

I can tell you that I have twelve 10 gallon breeder tanks set up all with 1.3 groups and have not had any issues. My opinon is that 1.4 in this tank is too many... 1.3 is just right.

Keep in mind tho, I use my food hopper that is in the sticky section of the ASF forum, and when using a wheel I hang it from the top of the tank.... this means that the entire floor of the tank is open space. I also pull all babies from the breeding group as soon as their eyes are open.

Hope this helps.