So u think that they're unsexable? How will I tell once they are beside the cranial hump? And as for substrate I used the African cichlids substrate that is at petsmart it's a 160 gallon tank I used 150 lbs of substrate the fronts ha CV e been in there growing for about 8 months I got them at 2 inches from imperial tropics would u say I need more fronts or is this enough for a decent breeding colony