Is this what you mean? _______ | | ______________ | | [ ] Regular airline | Pump |=3D=3D Reservoir =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D | | [______________] |_______ | =20 Yes, regular airline output goes into the 'fat' reservoir tube (I use 4 inches of 1 inch inner diameter tubing. Then the regular airline is attached to the other end. Not unlike a car muffler. My previously shy Taenicara Candidi seem much braver after the modification. I think that the reservoir damps out some of the percussion from the diaphragms. I am curious, on a similar line, has anyone else encountered benefits to their apistos of damping out vibrations to the tanks. I originally thought this was just so my house wouldn't hum but I think that there is probably more benefit to the fish than to me. Doug ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@listbox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@listbox.com. Search http://altavista.digital.com for "Apistogramma Mailing List Archives"!