I could use some advice or just opinions on this...I presently have two jacks and two cons in a 55 gallon tank... i have had them all togher since i bought them so they all get a along great. There is rarely any fighting going on between them but as they are getting bigger i was hoping to seperate them and possibly get rid of the cons. I was wondering what size tank/ filtraion i should get for the jacks and mayb possible tank mates for these guys...also keep in mind these are fairly tame jacks compared to many others i have seen...thanks