Stroid wrote: On meleve's site (cant seem to find it now) but he ran an expirement with xenia's in a tank with a pH of 8.0-8.1 and another tank with a pH of 8.3. he concluded that if the pH is low the xenia's will open and sway in the flow but will not pump or pulsate but in the tank that had 8.3 the xenia's where pumping all over the place. Seems the connection between pumping/pulsating and pH is what is probably holding back your xenia's just my 2 cents.