No way would 30 turbo's work out, 10 wouldnt even be a good idea. If you want Turbo's I would only do 2 with your tank. They get very big, they are clumsy and can knock over rockwork, corals very easily.
For glass and rock cleaners I like Astrea snails, they arent clumsy, dont get huge like the turbos, and do a gret job at cleaning.