false bottem pump prob in dart frog tank

[nat_the_brat]

Hi I have a false bottem in my dart tank with a pump + pipe underneath so that I have have imitation rain running along the top of the tank (make sense?) the pump was working great at first but the roots from plants seem to be clogging it and now it barely works at all. I think the pump I purchased was intended for table top fountains (which i was told would be ok but I am starting to think otherwise) I am wondering if anyone else has flase bottems and what they have found works for them. I am also wondering if anyone can recomend a good small pump that would be more sutible for false bottem (maybe has some sort of device that could prevent the plant roots from interfering with the water flow) thanks for any advice.
nat