re:Hair Algae

>From: Eric Schoville <schovill at expert_cc.purdue.edu>
>Date: Wed, 12 Apr 1995 11:29:19 -0500 (EST)
>I am having somewhat of a problem in my 75 gallon plant tank.
>Unfortunately, Spyrogyra or another type of hair algae got
>introduced from a plant from a pet store.  I've had it now for
>about two months.  It hasn't taken over my tank, and it has
>been pretty easy to scrape off the glass, but it is still 
>unsightly and I have been looking for a fish that will eat it.
>I am also wondering if it could be a problem with my set up.
>It is as follows.

Since you have hard water, mollies might be good to try.

>My water is hard and has a high pH.  I am also adding a CO2 system
>next week.  Will this help?

It almost certainly will give a boost to the plants.  If you have some
fast-growing plants, they might outcompete the algae.