I have a 10 gal tank, in the process of geting all the equiptment for a 30-40 gal. i bought a penuin 200 rated up to a 50 gal tank. i hooked it up to the 10 gal just to help out. should i run the undergravel fillter with the penuin? and i noticed the current was quite strong around the edges should i not be running this in a 10 gal or is there a way to turn it down?