I have two tanks right now. My 20 gallon long tank is an established tank for quite some time with platies and tetras. I have a newer 20 gallon tall tank that has been cycled and currently is home to 2 guppies. Question is: should I move some my current platies out of the old tank or should I buy new? I am curious about what all I could put in the new tank, being as it's taller. What would be some good fish? Since I have 2 guppies in there already...any suggestions are appreciated!