#ed_op#DIV#ed_cl#Nice. I like it. I diffiniantly need one of those. My overflow U tube has same problem with bubbles collecting inside it. It slowly reduce the output of the overflow, which draw more top-off until, my tank is super full : 0 and the salinity is out of whack. On the list for my next F&S order. thanks for the spot and the good idea.#ed_op#/DIV#ed_cl#