You're not being a pest at all. This section of the board does not receive much traffic, so don't feel ignored if you don't get responses.
Your angel may have Lymphocystis, Mouth Fungus (Columnaris), or some other kind of bacterial infection (it is my understanding that the term "cotton mouth" encompasses multiple diseases, most of them being bacterial). Lymph is untreatable but does not usually harm the fish. It comes and goes on its own but maintaining pristine water and feeding food of nutritional value seems to help it disappear. It can have a cottony appearance but often times will look like cauliflower.
Your fish probably doesn't have Columnaris, but it is a possibility. Keep in mind that fungal infections aren't very common and it could very well be bacterial. I would consider other possibilities before looking into this disease.
It could also be some sort of bacterial infection treatable with antibiotics. Administering Maracyn Two in a QT is one way of taking care of it. Here is a quote from Terry B concerning the use of Maracyn Two to treat bacterial infections:
"The correct dose for Maracyn-Two is using the double dose suggested for the first day EACH and EVERY day for at least a week. The dose suggested on the box is not strong enough for SW. If you use Nitrofurazone (Furacyn) go with 30mg/gal just one dose on the first day ONLY. Leave in Nitrofurazone 3 to 5 days. Check the ammonia and pH daily."
Hope this helps!
-lefty
