Suggest you think about getting 5 or 6 - 4" + fish. Getting someone to feed your discus once a day would then be ok - so long as they know how to feed - and not overfeed. That'll work when you're away for up to 5 days. -- Out of town for a couple of weekends a month - shouldn't be a problem. So long as they're fed well the rest of the time. As for water changes - your schedule is ok for that too - time it for when you're away on weekends - 50% wc's 2-3 X a week should be alright. Auto feeder - wouldn't recommend it - near adult discus - over 4" should be ok fed as little as 5 days/per week - not the greatest, but would fit with your schedule.