I have a sponge filter in my 125 gallon tank that has been in there for about 3 months. Some of my fish are getting aggressive as they are breeding and i want to take one of my EBJD's out and put her into a 20 gallon tank. If i use tank water and this sponge filter will the tank still have to cycle or will i be good to go? I dont want my female EBJD to die! they are very hard to come by in arizona especially at a mature size.