hello i build a fish pond about 7000 liter we had about 20 small fish about 10-16 cm long but my girlfriend bought 2 new today who are alot bigger about 35 cm and much thicker and all my small fish are affraid and 2 of my butterfly hide somewhere they swim like cracy when the big once come close i cant see them anymore are they going to get used to the 2 new once or do we have to get rid of the 2 new once?sry my english