Yup. Thanks guys. Float switches are the obvious answer. I suppose what's not so obvious to everyone is that I can't use them. I'm on an aggressive campaign to eliminate anything that hangs over the side of the tank. And I want any equipment in the tank to be invisible. That's why I'm going to all this silly pressure switch trouble.
And a float switch either has wiring hanging over the side (against the rules for me) or it could be threaded up through a bulkhead, but even then, it will be hanging out at the surface for all to see (again, against the rules for me).
Thanks for the suggestions though. It would be a lot easier if I'd back off on the aesthetics!
Steve - 33g reef and a 180g planted in need of a re-scape.
Last edited by scolley; 09-26-2005 at 12:06 PM.