I'm looking to buy a semen tank. Now my ai rep stores it all for me, but starting to do my own breeding. Doesn't need to be a huge tank, I won't be breeding much over 250 head a year. Looking for something that is high quality and will last a long time. 800-1200 straw capacity would be plenty. Would prefer something that holds nitrogen for 140+ days, I don't want to have to worry about filling it up all the time. Thank you for any suggestions