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Ac in tank

I just got a great instrument from Hanna Instruments. Its called the pH 
turtle. It connects a  PC computer running windows 3.1.1 or 95 etc to a 
pH probe, and allows you to graph the output  at various times into a log 
or graph.

Now the problem. My Fluval 403 and my Computherm heaters are inducing ~ 
0.01 ma apiece so I can't leave them on otherwise the meter goes crazy. 
If I ground the tank water, apart from creating a potential problem for 
the fish, I peg the probe at 14.0 pH.

So....What do you guys with the pH controllers do? Help George and any 
other EE's out there.

Best to you

Ric Cooney
RicCooney at Worldnet_att.net

"Any technology sufficiently advanced, is indistinguishable from magic."
Albert Einstein, (I think)