I need to immediatly seperate my green terror and jack dempsy , I need to get the gt into a 5 gallon bucket because he is REALLY beat up, both are adult and unfortunatly I just did a 50 percent water change. Should I just put the gt in new water or suck 5 gallons out of the old tank and then put him in and replace the water? 
or is threr any way to fashon a divider?

or is threr any way to fashon a divider?