If you have algy, its better to address the underlying issue than trying to put a band aid on it. Algy is caused by poor water husbandry, excess nutrients. Use only ro/di water increase the water changes and feed less.
I have a tomini tang that is always picking at the rockwork for algae and a model citizen so I would say they would be a pretty safe bet and pretty calm so could be ok in a 65, the one fish the tomini hates is my lawnmower blenny apparently they compete for the same food hence the conflict so you might want to consider the blenny if you already have a heavy fish load and the blenny is a very interesting fish to watch so a good add to a reef tank.