Interesting to know that corals take pellets too....may restart coral keeping again as this will lighten the troubles of getting frozen food for them...
Marine fishes can be as tolerant as fresh water fishes but if stave for too long...it will forget how to eat then it is as good as days are numbered...
Leave it as long as the fish is still swimming naturally. Ich is like fever or flu, will go away once the fish beef up its immune system. The more medicine or changing of its environment will cause stress and likely to make it worst....
Actually after you shop around for a while, you will know roughly the price range. The best is T95 you can bargain the price down if you one go buy lots of stuffs.
me sometimes also face the dilemma.....saw some aquarium display blowing water to the top surface but some tune the head down....dont know which position is better...