I have a 90 gallon tank with 3 four inch Red Severums and 1 six inch Gold Severum.One on my Reds just layed eggs with the six inch Gold last night.I saw them laying eggs,the Red is the female.Questions I have is,I thought they layed eggs on a flat surface? These guys layed them on a piece of slate leaning against the side of the tank.Like an Angel or Discus would do.Is that normal?This is the first time they layed eggs.Also with a Red and a Gold mix,what would the fry look like when they got bigger?