HELP!! A petsitter's guide.

[Xtasia]

I'm going away for a few days and I need to type out a quick guide for my roommate on "signs things aren't going well in the saltwater tank".. I haven't done a very good job educating him prior to this, so he thinks EVERTHING is cause for concern… Please help me type out a few things that a complete noobie can look out for... like.. cloudiness of water.. and fish floating on the surface upside down :P