I love the ghost shrimp, and the red cherry shrimp, but will I have to give up my back filters in order to have these? I would love a tank full of ghost shrimp to breed and feed to my chilids. can I use my back filter on my 20 gallon ? if not what type filter do I use? do I have to have a planted tank, I would like to plant the tank with fake plants only and 1 ball of moss .