my husband and i are both equally addicted to this hobby. i handle most of the water changes and water testing, he handles all the plumbing, lighting and equipment.
cyano can be caused by lack of circulation (is the cyano showing up where your power heads dont circulate?) or it can be caused by too long of lighting or old bulbs.
as long as your water quality is good, the abrasion should heal on it's own. my two tangs have gotten a few battle wounds from playin rough and i just left them and they healed within a couple days.