it is kind of wreckless of you to have put anouther pair of clowns in your tank, least harmless is their attitude to monopolise everything which is what your original ones are doing, second of all it was highly insane to add a second pair of clowns into your tank and whoever gave u the idea is made. your originals will most probably continue to stress out your nemo's until they die i would say! they are red light warning to even try mixing together and unless you get like a 1 in 1000 of 2 highly shy or friendly clown fish mixing usually doesnt turn out well!.
i would be taking 1 of the 2 pairs back to the shop or moving them to a new tank because as it sounds it wont be a happy ending! really confuses me that you would even think to add 2 new clowns to a tank after having 2 establish their territory withing the tank and i mean they will defend any area of any tank no matter how big the tank!
sorry for the attitude but the first thing you should have been taught about annenomi fish is to never add more in after youve established some in a tank.
