Two pumps on one outlet?

[psyrob]

Any problem with putting two pumps on relay 5 or 6 using an extension cord or multi-outlet plug? I want to add a little hydor pump for my frag tank and want wave maker function but I am out of outlets...

[rimai]

The relay can handle, although the spike arrestor circuitry may not absorb multiple pumps.
If you start experiencing interference problems on the controller, you know what it is causing it.