I started a tank about a month ago with 4 baby RBP's. They've grown about an inch so far and overall look great. I have them in a 55 (for now) with one filter rated for 55-70gal. I would like to add another smaller filter (maybe something like a 30gal filter) to the other side of the tank, but I've always been under the impression that they like calm water (they tend to avoid the part of the tank where the filter drains out, and at their small size of 1-2" it seems to toss them around.) I see some people around the forums telling other to add some current, though. Should I? And would adding a second filter now be best or could I get away with waiting until they get a little bigger?