I am going to europe from May 24th thru June 12th. Which is a total of 19 days. Now I usually do about a 75% water change weekly on all my tanks but since I am going to be gone for so long I am worried about the water changes that I am going to miss. I can have a friend stop by to feed twice a week which wouldnt be a problem. But I was thinking of doing 2-3 large water changes a week before i go and 2 large water changes during the week when i get back. What do you guys think? And what have you done in the past when you went on vacation for awhile?