Size doesnt help in sexing Blue Ram, Females can be bigger or smaller, it depends on age and food availability. Males can have the same amount of red in there tummys as the female. Finiage can be a helpful factor in determining sex, males have higher and bigger dorsal fins, with a long black point at the front, but again i have seen females with this aswell. Keep them in a stable tank, and what i mean by that, is dont move a stone to them, it could put them off, have places in the tank that they can readily spawn on, try not to get to close to were they've spawned, leave them be, if they feel threatend by you they can and will eat the eggs. I no it seems exciting that they've spawned and there doing there parenting thing, but you have a higher chance of a succesful spawn if your not putting ur face right up to the tank to stare at them every few minutes, or as some, iv heard of getting up in the middle of the night with a torch to see if the eggs have hatched yet, and they wake up in the moring to find there gone, because the parents felt threatened.
The dwarf flag in your bag (poetic) looks exactly like my male, accept because it is stressed it has lost some colour. Im currently breeding the Dwarf Flags, will let you know when i have some available. Unless steve has some available first.
Shae
Shae