Resizing an aquarium with mature fish often cause's problems. Some
soloutions work, and others don't. When the fish are first bought, and
put in the tank, (this case a 40g) they are all pretty much the same
physical size. As such they aquire there territory, and get along ok.
Now at a later point in time, they are moved and introduced in another
tank, now, as they begin to re establish tank territory, they are no
long of semi-equal size.IMO the best method to avoid this from
happening, is to properly research the fish you are going to purchase,
and put them in a proper sized tank at the onset. Unfortunatly, the LFS
where you do your original purchase, are, for the most part only
concerned with making a sale, not really educating the new owners to as
what they must have. Hopefuly enough ppl will begin to research there
fish, and these types of situations will not need to occur.



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