Regardless of what critters you use to help control to outbreak, you still need to address the source or the problem. I agree with you that the tap water caused the problems by probably adding phosphates to the system.
Have you tested for phosphates? Do you use phosphate remover?
Even if the phosphate readings are 0 they still may be present since hair algae is very efficient at using it. Also remember that as the hair algae dies it puts the phosphates back into the water column which is then available to help colonize other areas of your tank. If you currently don't use phosphate remover, you may want to consider doing so. I know you don't have room for a phosban reactor but you may have room to put a bag of phosphate remover in.
I'm just getting over a bad outbreak of hair algae but mine was caused by an old bulb (you might want to check this as well). When I replaced the bulb the problem didn't go away, but as soon as I started using phosphate remover the algae began to subside.
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