) If you ended up having to push off the new tank in the future and you had a 20L full of fish that is not even big enough to accomodate one.i would wait untill you had this 55gallon before you get another.Daveo said:Sorry..... I forgot to add that info. Well, they would be in a twenty gal long and would be placed In a much larger tank in no time(the tank will be at least 55 gal min, and will have within nine months). 8)