Hello I need some advice on a filter for my two dwarf frogs, I know some sites say you don't have to have one but I would rather have one to help keep the tank cleaner. So I was wanting to know do any vibration's from a filter bother the frogs that much? They are in a 15 gallon round tank and so I cant just use any filter like you can with a square tank because you can't hang them on the side of a round tank. The tank came with a filter that is in the top of the lid I don't think that the water current is that strong so I have watched them and they can still swim to the top just fine, I just wasn't sure about the vibration of the filter it's not too bad but there is a little vibration. Does anyone have any suggestions if they should be ok with the filter or should I not use one? Thanks!