if you could convince him to do a large water change and then continue with Monthly changes of about 10 to 20 gal, I think you have a good chance of getting it back on tract. fist find out if he has medicated the tank as to me that sounds like more of a reason for inverts dieing than lack of water changes.
If he has you will have to throw out the rock and substrate and start all over. if not there is a good chance.
I differ from Bev in that I do not feel weekly or biweekly water changes are necessary (and also boarderline obsessive compluslive
) I lean more to wards 10 to 20% ever month or two depending on how much of a load you have in the tank.
Steve
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