Another newbie question...Our water tank (50 gal) was last drained in early sept. It gets topped off with 25 gal about every 3 days (a bred heifer and 3 pygmy goats drink from it). It has had green algae for a while. Should I drain it, rinse it with bleach, and refill it? I haven't felt like it as it is cold, but I don't know if I may be doing my gals an injustice by leaving it until early spring. They have never acted sick. The tank has a heater in it that kicks on when the temp is below 40, so I'm sure that contributes to the algae bloom. Thanks for letting me know whether or not this is much ado about nothing.