Hi I have 200L tank with 3 fancies in, mixed veil, oranda & black moor. They are all still quite & not or no where near fully grown as yet. I would like to put a different type of fish with them but a bit unsure. Someone told me I could put either mollies, guppies or tetras with them, however ever -m unsure as they are tropical. I do have excellent filteration which has a heater on it how ever am not using just now & do 50% water changes per week. So can any of these live with fancies, (guppies, tetras or mollies) Looking round myself I've found rainbow minow can live with goldfish? Can anyone tell me where I could buy these in any south london aquatics shops? Thanks in advance & thanks for reading.